Softpedia >Linux >Communications >Email >Thunderbird >  Changelog

Thunderbird Changelog

What's new in Thunderbird 115.10.0

Apr 18, 2024
  • FIXED:
  • Creating a tag in General Settings with a number as the tag name did not work
  • Quick Filter button selections did not persist after restart
  • Collapsing and expanding message list headers sometimes caused header to scroll out of view
  • Single message with no children inside a parent thread sometimes displayed incorrectly as a thread with a duplicate of itself as its child
  • "Get selected messages" menu items did not work
  • "Download and Sync Messages" dialog was too short when using Russian locale, obscuring OK button
  • After changing password on an IMAP account, the account could become locked due to too many failed login attempts
  • Retrieving multiline POP3 message from server failed if message chunk ended in newline instead of carriage return and newline
  • IMAP, POP3, and SMTP Exchange autoconfiguration did not support encryption configuration
  • Non-empty address book search bar interfered with displaying/editing contacts
  • Deleting attendees from "Invite Attendees" view removed attendees from view, but not from invite
  • Splitter arrow between task list and task description did not behave as expected
  • Performance improvements and code cleanup
  • Security fixes

New in Thunderbird 115.9.0 (Apr 1, 2024)

  • FIXES:
  • Opened ignored messages in a message thread/subthread were not marked as read in IMAP folders
  • Multi-language spellcheck sometimes skipped languages
  • Thread tree did not update when live language switching
  • Visual improvements to "Reorder Attachments" popup
  • Sort order was sometimes incorrect in Grouped By views
  • Selecting "Match all messages" in Filter Rules dialog did not disable all search criteria
  • S/MIME-only signed messages sometimes incorrectly displayed signature as invalid
  • OpenPGP keys uploaded to an HKP keyserver were sent with the wrong Content-Type header
  • Keyboard navigation within search toolbar did not work
  • Flatpak builds only had the en-US spell check dictionary available
  • Security fixes

New in Thunderbird 115.8.1 (Mar 7, 2024)

  • FIXES:
  • Settings: Updating tags failed if Automatic Updates were disabled
  • Size of collapsed folders in folder pane did not include size of subfolders
  • Reversing sort order of Grouped By views in quick search did not reverse
  • Removing threaded messages in a unified folder sometimes resulted in an incorrect number of levels in the thread
  • Thread collapsing did not behave correctly when copying thread messages in multi-folder view
  • S/MIME encryption failed to encrypt if unsupported certificate type was encountered
  • Decrypting a copy of an S/MIME encrypted, opaque-signed message created an unreadable message
  • Thunderbird sometimes changed the subject of messages selected while simultaneously decrypting a large PGP-encrypted message
  • "Quote message" menu item in compose window did not work when replying to message opened in separate tab
  • Toolbar customization window contents overflowed the window width

New in Thunderbird 115.8.0 (Feb 26, 2024)

  • NEW:
  • Added option to show packet dump when OpenPGP fails to decrypt
  • FIXED:
  • Thunderbird slowed down significantly when opening email files (.eml)
  • Inbox view intermittently reverted to default view after moving or deleting messages
  • Size of collapsed folders in folder pane did not include size of subfolders
  • Hovering over folder does not always expand subfolders
  • Switching to thread pane of a folder using keyboard navigation did not focus top message
  • Clicking "Sent unsent messages" in Outbox context menu while in offline mode did not prompt user to go online
  • Mail tab-specific Unified Toolbar buttons received focus incorrectly
  • Quick Filter settings did not persist when Quick Filter bar was turned off
  • Quick Filters were unusually slow
  • OpenPGP Key Manager filtering did not work
  • OpenPGP sometimes attempted to decrypt message with incorrect key
  • Autoconfig failed on servers that did not support OAuth2
  • Opening different attachments with the same name in different messages could cause attachment files to become conflated
  • Overflowed attachment list could not be scrolled
  • Passwords disappeared from password manager list after applying and clearing filters
  • Cookies in cookie manager list disappeared after applying and then clearing filters

New in Thunderbird 115.7.0 (Jan 25, 2024)

  • NEW:
  • Autocrypt Gossip key distribution added
  • FIXED:
  • When starting Thunderbird, unread message count did not appear on collapsed accounts
  • Blank window was sometimes displayed when starting Thunderbird
  • Thunderbird "--chrome" flag incorrectly opened extra messenger.xhtml
  • Add-ons did not start correctly when opening Thunderbird from other programs
  • Drag-and-drop installation of add-ons did not work if Add-ons Manager was opened from Unified Toolbar
  • Double-clicking empty space in message pane incorrectly opened the currently selected message
  • Canceling SMTP send before progress reached 100% did not stop message from sending
  • PDF attachments open in a separate tab did not always restore correctly after restarting Thunderbird
  • Some OpenPGP dialogs were too small for their contents
  • Account Manager did not work with hostnames entered as punycode
  • Downloading complete message from POP3 headers caused message tab/window to close when "Close message window/tab on move or delete" was enabled
  • Some ECC GPG keys could not be exported
  • Contacts deleted from mailing list view still visible in Details view
  • After selecting contacts in Address Book and starting a new search, the search results list did not update
  • Various UX and visual improvements
  • Security fixes

New in Thunderbird 115.6.1 (Jan 11, 2024)

  • NEW:
  • OAuth2 now supported for comcast.net
  • FIXED:
  • High CPU usage sometimes occurred with IMAP CONDSTORE (conditional STORE) enabled
  • Replying to a collapsed thread via keyboard shortcut (Ctrl+R/Cmd+R) opened a reply for every message in the thread
  • Enabling Grouped By view after reversing sort order of column header caused messages to be grouped incorrectly
  • Opening thread pane context menu via keyboard did not always scroll view to selection
  • New mail indicator for POP3 accounts did not indicate new messages ready to be downloaded
  • Messages could not be moved to folders using Message > Move To if text or a link in the message had been clicked on first
  • MIME part boundaries were not properly terminated

New in Thunderbird 115.0 (Aug 7, 2023)

  • Dynamic Unified Toolbar:
  • Supernova features a single dynamic toolbar, presenting frequently used and contextual options based on the tab or Space that is currently active. Take full control by customizing the toolbar and window layout to perfectly fit your workflow.
  • Beautiful Iconography:
  • More than just a refreshed set of graphics, Supernova introduces beautiful icons with a more consistent visual style unique to Thunderbird. Our new designs remain sharp and pixel-perfect at any density setting.
  • Easy Density Control:
  • Working with multiple monitors and display resolutions? Supernova lets you dial in the perfect density settings and font sizes for the entire application, with just a single click from the App Menu.
  • Intuitive App Menu:
  • The new Application Menu (≡) in Supernova is now keyboard-accessible, and redesigned for faster, easier navigation. Fewer submenus, persistent global options, and consistent iconography combine to create a much more intuitive experience.
  • New + Sortable Folder Modes:
  • Supernova gives you more control by introducing sortable Folder Modes. Display all of your Tags in the Folder Pane, turn on and off Local Folders, or move your favorite Folder Mode sections up and down with one click. Less scrolling, more productivity.
  • Eye-Catching Tags View:
  • Tags are a familiar and powerful part of your workflow, so Supernova adds an eye-catching “Tags” view to the Folder Pane. Quickly jump to your custom, color-coded tag categories to find and filter your messages even faster.
  • Modernized Cards View:
  • Supernova’s new Card View is our version of the well-known vertical layout for the Message List, perfect for people used to modern webmail. Card View emulates a mobile interface list with multi-line support, offering a more comfortable appearance to reduce cognitive burden.
  • Improved Address Book:
  • Supernova continues to iterate on the modernized Address Book introduced in Thunderbird 102. You’ll enjoy a new tabular view, an improved Edit view, delete buttons, and better accessibility.
  • Expanded Accessibility:
  • Supernova substantially improves Thunderbird’s keyboard navigation and screen reader accessibility across the entire application. We’ve also greatly expanded the ability to navigate Mail content and buttons using the TAB and arrow keys.
  • Improved Calendar Design:
  • As part of an ongoing effort to modernize and upgrade Thunderbird’s Calendar, Supernova introduces an improved “mini-month” layout, improvements to the day/week/month grid, a pleasing color palette, and several more minor changes.

New in Thunderbird 102.13.0 (Jul 9, 2023)

  • CHANGES:
  • Release notes opened from about: dialog will now open in the default web browser
  • FIXES:
  • Upstream RNP version numbers now recognized as official in about:support
  • Security fixes

New in Thunderbird 102.12.0 (Jun 8, 2023)

  • FIXES:
  • "Searching the directory for recipients certificates" popup could block compose window when "S/MIME reminder" was enabled and using an LDAP address book
  • Some elements still used animations with "prefers-reduced-motion" set
  • Visual and theme improvements
  • Security fixes

New in Thunderbird 102.11.2 (May 27, 2023)

  • FIXES:
  • Thunderbird 102.11.1 contained POP3 client regressions with offline mode and TLS certificate overrides

New in Thunderbird 102.11.1 (May 25, 2023)

  • FIXES:
  • POP message retrieval stopped after a network error occurred and connectivity was restored
  • Reused SMTP connections sometimes silently disconnected, causing timeouts
  • Thunderbird could freeze if saving a sent message to IMAP failed
  • Creating OpenPGP keys with no expiration was not possible
  • News reader did not always issue GROUP command after authentication with remote server, preventing Thundebird from displaying or refreshing news from the server

New in Thunderbird 102.11.0 (May 11, 2023)

  • FIXES:
  • During Account Setup, the "Checking password..." message was not removed after a failure
  • Miscellaneous UI fixes
  • Security fixes

New in Thunderbird 102.10.1 (Apr 26, 2023)

  • Fixes:
  • Messages with missing or corrupt "From:" header did not display message header buttons
  • Composer repeatedly prompted for S/MIME smartcard signing/encryption password
  • Address Book integration did not work with macOS 11.4 Bug Sur
  • Mexico City DST fix in Thunderbird 102.10.0 (bug 1826146) was incomplete

New in Thunderbird 102.10.0 (Apr 12, 2023)

  • CHANGES:
  • New messages will automatically select S/MIME if configured and OpenPGP is not
  • FIXES:
  • Calendar events with timezone America/Mexico_City incorrectly applied Daylight Savings Time
  • Security fixes

New in Thunderbird 102.9.1 (Mar 29, 2023)

  • FIXES:
  • Thunderbird was unable to open file URLs from command line (URLs beginning with "file://")
  • Source strings for localized builds not uploaded to FTP as expected
  • Visual and theme improvements
  • Security fixes

New in Thunderbird 102.9.0 (Mar 19, 2023)

  • FIXES:
  • Notification about a sender's changed OpenPGP key was not immediately visible
  • TLS Certificate Override dialog did not appear when retrieving messages via IMAP using "Get Messages" context menu
  • Spellcheck dictionaries were missing from localized Thunderbird builds that should have included them
  • Tooltips for "Show/Hide" calendar toggle did not display
  • Various security fixes

New in Thunderbird 102.8.0 (Feb 19, 2023)

  • NEW:
  • The Troubleshooting Information page now displays version of the OpenPGP backend library used by Thunderbird.
  • Added option to build RNP library with OpenSSL backend (use "--with-librnp-backend=openssl" configure option)
  • FIXES:
  • "Get Messages" did not retrieve messages from Gmail accounts using a local folder as a deferred inbox
  • Various visual and UX improvements
  • VARIOUS SECURITY FIXES:
  • Known Issues
  • unresolved
  • Source strings for localized builds not uploaded to FTP as expected

New in Thunderbird 102.7.2 (Feb 13, 2023)

  • FIXES:
  • Various crash fixes

New in Thunderbird 102.7.1 (Feb 3, 2023)

  • FIXES:
  • Microsoft Office 365 accounts were unable to authenticate
  • Switching identities caused remote images in HTML signatures to not be shown
  • Thunderbird failed to import vCards that contained "rrn" line endings
  • Contribution button for add-ons opened Contribution page in a Thunderbird tab, instead of the external browser
  • XMPP did not respond to unrecognized IQ queries, causing some servers to close the connection
  • Window titlebar buttons (minimize/maximize/close) were not displayed in Windows 10 "Dark" color mode
  • Various security fixes

New in Thunderbird 102.7.0 (Jan 20, 2023)

  • WHAT'S NEW:
  • Enterprise policies now support Thunderbird-specific preferences
  • FIXES:
  • Localized builds and langpacks now use "comm-l10n" repository; downstream builds using official langpacks should not need to make changes
  • Having too many folders open at startup caused loss of MSF files
  • Copying an email from one local folder to another local folder sometimes caused "Another Operation is using the folder" error on Windows 7
  • Email address pill allowed for incorrectly formatted email addresses
  • Creating security exceptions for messages sent using a self-signed certificate failed if hostname contained uppercase letters
  • S/MIME certificate verification was prohibitively slow
  • OpenPGP key import failed for key blocks with comments that contain Unicode characters
  • Chat conversation sidebar was too wide under certain circumstances, making scrollbar unusable
  • On Mac, deleting events from Today Pane with "Backspace" key deleted selected messages instead
  • VARIOUS SECURITY FIXES:
  • OAuth2 authentication not working for Microsoft 365 Enterprise accounts. See the Blog post for additional information. Bug 1810760

New in Thunderbird 102.6.1 (Dec 22, 2022)

  • FIXED:
  • Remote content did not load in user-defined signatures
  • Addons that added new action buttons were not shown for addon upgrades, requiring removal and reinstall
  • Various stability improvements
  • Security fix

New in Thunderbird 102.6.0 (Dec 14, 2022)

  • FIXES:
  • Importing secret OpenPGP keys failed when public key with public subkey was already present
  • Message index files were incorrectly deleted when too many folders were opened
  • Thunderbird sometimes incorrectly formatted synced vCards
  • Recurring events did not display past a certain number of repetitions
  • Cookies deleted from the "Show Cookies" dialog were not actually deleted
  • Paused RSS feeds did not actually pause updates
  • Various visual and UX improvements
  • Various security fixes

New in Thunderbird 102.5.1 (Dec 5, 2022)

  • CHANGES:
  • Mail extension API updates. See Mail Extension API Docs.
  • FIXES:
  • "Copy to again" menu item was not present after copying message to folder with Unicode name on Unicode-enabled IMAP server
  • Calendar date picker was displayed behind "Send Later" window
  • Various security fixes

New in Thunderbird 102.5.0 (Nov 16, 2022)

  • CHANGED:
  • Ctrl+N shortcut to create new contacts from address book restored
  • FIXED:
  • Account Settings UI did not update to reflect default identity changes
  • New POP mail notifications were incorrectly shown for messages marked by filters as read or junk
  • Connecting to an IMAP server configured to use PREAUTH caused Thunderbird to hang
  • Error responses received in greeting header from NNTP servers did not display error message
  • News messages sent using "Send Later" failed to send after going back online
  • "Download/Sync Now..." did not completely sync all newsgroups before going offline
  • Username was missing from error dialog on failed login to news server
  • Thunderbird can now fetch RSS channel feeds with incomplete channel URL
  • Add-on "Contribute" button in Add-ons Manager did not work
  • Help text for /part Matrix command was incorrect
  • Invite Attendees dialog did not fetch free/busy info for attendees with encoded characters in their name
  • Various security fixes

New in Thunderbird 102.4.2 (Nov 4, 2022)

  • CHANGES:
  • "Address Book" button in Account Central will now create a CardDAV address book instead of a local address book
  • FIXES:
  • Messages fetched from POP server in Fetch headers only mode disappeared when moved to different folder by filter action
  • Thunderbird re-downloaded locally deleted messages from a POP server when "Leave messages on server" and "Until I delete them" were enabled
  • Multiple password prompts for the same POP account could be displayed
  • IMAP authentication failed on next startup if ImapMail folder was deleted by user
  • Retrieving passwords for authenticated NNTP accounts could fail due to obsolete preferences in a users profile on every startup
  • Get Next n Messages did not consistently fetch all messages requested from NNTP server
  • Get Messages button unable to fetch messages from NNTP server if root folder not selected
  • Thunderbird text branding did not always match locale of localized build
  • Thunderbird installer and Thunderbird updater created Windows shortcuts with different names
  • LDAP search filters unable to work with non-ASCII characters
  • "Today" highlighting in Calendar Month view did not update after date change at midnight

New in Thunderbird 102.4.1 (Oct 29, 2022)

  • WHAT'S NEW:
  • Thunderbird will now catch and report errors parsing vCards that contain incorrectly formatted dates
  • FIXES:
  • Dynamic language switching did not update interface when switched to right-to-left languages
  • Custom header data was discarded after messages were saved as draft and reopened
  • -remote command line argument did not work, affecting integration with various applications such as LibreOffice
  • Messages received via some SMS-to-email services could not display images
  • VCards with nickname field set could not be edited
  • Some recurring events were missing from Agenda on first load
  • Download requests for remote ICS calendars incorrectly set "Accept" header to text/xml
  • Monthly events created on the 31st of a month with

New in Thunderbird 102.4.0 (Oct 20, 2022)

  • CHANGES:
  • Thunderbird will automatically detect and repair OpenPGP key storage corruption caused by using the profile import tool in Thunderbird 102
  • FIXED:
  • POP message download into a large folder (~13000 messages) caused Thunderbird to temporarily freeze
  • Forwarding messages with special characters in Subject failed on Windows
  • Links for FileLink attachments were not added when attachment filename contained Unicode characters
  • Address Book display pane continued to show contacts after deletion
  • Printing address book did not include all contact details
  • CardDAV contacts without a Name property did not save to Google Contacts
  • "Publish Calendar" did not work
  • Calendar database storage improvements
  • Incorrectly handled error responses from CalDAV servers sometimes caused events to disappear from calendar
  • Various visual and UX improvements

New in Thunderbird 102.3.2 (Oct 12, 2022)

  • CHANGES:
  • Thunderbird will try to use POP CRAM-MD5 authentication even if not advertised by server
  • FIXES:
  • Checking messages on POP3 accounts caused POP folder to lock if mail server was slow or non-responsive
  • Newsgroups named with consecutive dots would not appear when refreshing list of newsgroups
  • Sending news articles containing lines starting with dot were sometimes clipped
  • CardDAV server sync silently failed if sync token expired
  • Contacts from LDAP on macOS address books were not displayed
  • Chat account input now accepts URIs for supported chat protocols
  • Chat ScreenName field was not migrated to new address book
  • Creating a New Event from the Today Pane used the currently selected day from the main calendar instead of from the Today Pane
  • New Event button in Today Pane was incorrectly disabled sometimes
  • Event reminder windows did not close after being dismissed or snoozed
  • Improved performance of recurring event date calculation
  • Quarterly calendar events on the last day of the month repeated one month early
  • Thunderbird would hang if calendar event exceeded the year 2035
  • Whitespace in calendar events was incorrectly handled when upgrading from Thunderbird 91 to 102
  • Various visual and UX improvements

New in Thunderbird 102.3.1 (Sep 29, 2022)

  • CHANGES:
  • Compose window encryption options now only appear for encryption technologies that have already been configured
  • Number of contacts in currently selected address book now displayed at bottom of Address Book list column
  • FIXES:
  • Password prompt did not include server hostname for POP servers
  • Edit Contact was missing from Contacts sidebar context menus
  • Address Book contact lists cut off display of some characters, the result being unreadable
  • Menu items for dark-themed alarm dialog were invisible on Windows 7
  • Various security fixes

New in Thunderbird 102.3.0 (Sep 21, 2022)

  • CHANGES:
  • Thunderbird will no longer attempt to import account passwords when importing from another Thunderbird profile in order to prevent profile corruption and permanent data loss.
  • Devtools performance profile will use Thunderbird presets instead of Web Developer
  • FIXES:
  • Thunderbird startup performance improvements
  • Saving email source and images failed
  • Error message was shown repeatedly when temporary disk space was full
  • Attaching OpenPGP keys without a set size to non-encrypted messages briefly displayed a size of zero bytes
  • Global Search entry box initially contained "undefined"
  • Delete from POP Server mail filter rule intermittently failed to trigger
  • Connections to POP3 servers without UIDL support failed
  • Pop accounts with "Fetch headers only" set downloaded complete messages if server did not advertise TOP capability
  • "File -> New -> Address Book Contact" from Compose window did not work
  • Attach "My vCard" option in compose window was not available
  • Improved performance of matching a contact to an email address
  • Address book only recognized a contact's first two email addresses
  • Address book search and autocomplete failed if a contact vCard could not be parsed
  • Downloading NNTP messages for offline use failed
  • NNTP client became stuck when connecting to Public-Inbox servers
  • Various visual and UX improvements:
  • Various security fixes:
  • No dedicated "Department" field in address book

New in Thunderbird 102.2.2 (Sep 8, 2022)

  • CHANGES:
  • Setting added to change Calendar event double-click action to open Edit Event dialog rather than view only; Set calendar.events.defaultActionEdit to true.
  • FIXES:
  • Running Compact Folders on maildir folders caused a redownload of all messages in the folder
  • Accessing mail folders in profiles with many folders was slow
  • SMTP servers were not always properly initialized, and were not listed in Account Settings
  • APOP authentication unsupported when connecting to POP3 server
  • OpenPGP key discovery failed
  • POP accounts hosted by AOL were not able to authenticate using OAuth2
  • Unable to open context menu in newsgroups header for groups that are not subscribed

New in Thunderbird 102.2.1 (Sep 1, 2022)

  • CHANGES:
  • Buttons to connect automatically discovered Address Books and Calendar during Account Setup now displayed
  • FIXES:
  • Compacting IMAP folders failed when "Just mark as deleted" was set
  • message threading status and sort order was not transferred when applying column layout to other folders
  • Folder names with half-width Kana characters were displayed incorrectly
  • Digital signing of messages was not disabled after switching to an identity that could not sign
  • POP message retrieval stopped after a network error occurred and connectivity was restored
  • Activity Manager didn't show "Get Messages" activity when "Leave messages on server" was turned off and no new messages were found
  • Mail quota color did not update properly for multiple accounts
  • Profile export failed if an expected file did not exist
  • Check Spelling dialog could exceed screen size when many dictionaries were available
  • Dragging a news message to the Desktop caused Thunderbird to hang when synchronized for offline use
  • Remove All Expired Articles was not displayed on expired NNTP messages
  • Sending messages to encrypted Matrix rooms failed in some cases
  • Adding a CalDAV calendar on BSD-based OS's failed due to DNS errors
  • Various visual and UX improvements
  • VARIOUS SECURITY FIXES:
  • "Get Map" feature missing from address book for physical addresses
  • unresolved
  • No dedicated "Department" field in address book

New in Thunderbird 102.2.0 (Aug 23, 2022)

  • FIXES:
  • The fix for bug 1777765 (no POP download progress bar) was backed out from this release to address broken POP message download with Fetch headers only selected in Account Settings (bug 1783552).
  • KNOWN ISSUES:
  • unresolved:
  • No progress bar shown for POP message downloads
  • "Get Map" feature missing from address book for physical addresses
  • Custom fields missing from address book
  • No dedicated "Department" field in address book

New in Thunderbird 102.1.2 (Aug 9, 2022)

  • FIXES:
  • The fix for bug 1777765 (no POP download progress bar) was backed out from this release to address broken POP message download with Fetch headers only selected in Account Settings (bug 1783552).
  • KNOWN ISSUES:
  • No progress bar shown for POP message downloads
  • "Get Map" feature missing from address book for physical addresses
  • Custom fields missing from address book
  • No dedicated "Department" field in address book

New in Thunderbird 102.1.1 (Aug 6, 2022)

  • CHANGES:
  • OpenPGP Key Manager will clear selected keys after a deletion is performed
  • FIXES:
  • Update notification popups were still displayed after switching to another desktop workspace on Linux
  • macOS display issues made Thunderbird unusable
  • OpenPGP public key was not automatically attached after enabling encryption from reminder and default setting is "Do not encrypt"
  • Importing OpenPGP keys stored in binary format failed
  • Exporting an OpenPGP public key from Account Settings failed
  • Saving encrypted OpenPGP attachments created corrupt files
  • Receiving many OpenPGP keys in a single email caused Thunderbird to hang
  • POP3 message download progress bar was not displayed
  • OAuth2 authentication was not available when the mail domain did not match the OAuth provider domain
  • OAuth did not work with some POP servers
  • RSS feed URL links in headers panel could not be activated by keyboard
  • Self-signed TLS certificates did not work with POP3 connections
  • Non-ascii characters in passwords did not work with POP3 connections
  • An error was not displayed when an incorrect password was entered for a POP3 account
  • NNTP articles were not displayed in preview pane when a Primary Password was set
  • NNTP articles did not download when the hostname of the server was not all in lower-case
  • Saving NNTP messages to local disk failed
  • Drag and Drop from Address Book into Compose window sometimes added unexpected contacts to the target
  • "Default" label not shown for emails when editing a contact
  • Contact Title, Role, and Organization fields could be displayed in the wrong order
  • Contact birthdays on February 29 were displayed incorrectly in non-leap years
  • Detection of photos in vCards improved
  • Drag and drop contacts to another address book was not available
  • Contacts stored in a Google CardDAV address book contained extra backslashes in text fields
  • Contacts without First/Last/Display Names appeared blank in contact list
  • Auto-attaching vCard and OpenPGP keys did not always work as expected
  • Settings page used caused excessive CPU usage
  • Calendar did not respect Date and Time Formatting in Settings
  • OpenPGP Key Import wizard did not adapt to dark theme
  • Various visual and theme improvements
  • Various accessibility improvements
  • KNOWN ISSUES:
  • "Get Map" feature missing from address book for physical addresses
  • Custom fields missing from address book
  • No dedicated "Department" field in address book

New in Thunderbird 102.0.3 (Jul 28, 2022)

  • CHANGES:
  • Support for Google Talk chat accounts removed
  • FIXES:
  • Thunderbird could crash on startup on Windows 11
  • After compacting folders, new downloaded messages were inaccessible
  • Marking a message as a Favorite (starred) did not update the thread pane when using Unified Folders
  • Compose window failed to populate some fields when S/MIME was configured
  • Non-text attachments has an incorrect "charset=windows-1250" mime header
  • Messages sent as attachments incorrectly had an "X-Mozilla-Cloud-Part" header
  • Improved Address Book import/export support in Profile Importer
  • IMAP stability improvements
  • Offline cache was unusable for NNTP accounts
  • Signing S/MIME messages failed
  • Various UI improvements

New in Thunderbird 102.0.2 (Jul 11, 2022)

  • FIXES:
  • Mailbox MSF files could become corrupt in some circumstances
  • OpenPGP Key Assistant did not show status for addresses handled by aliases
  • Attaching an external OpenPGP public key failed if configured with a subkey ID
  • Thunderbird continued using an old password after changing it
  • New mail notifications were only shown for one mail account when multiple accounts were configured
  • LDAP Address Books could not be configured using IPv6 address literals
  • CardDAV contacts (notably Google-hosted) with more than one email address were not always editable
  • Address Book accessibility improvements
  • Various UI improvements
  • Icons converted to new style

New in Thunderbird 102.0.1 (Jul 8, 2022)

  • FIXES:
  • Mailbox MSF files could become corrupt in some circumstances
  • OpenPGP Key Assistant did not show status for addresses handled by aliases
  • Attaching an external OpenPGP public key failed if configured with a subkey ID
  • Thunderbird continued using an old password after changing it
  • New mail notifications were only shown for one mail account when multiple accounts were configured
  • LDAP Address Books could not be configured using IPv6 address literals
  • CardDAV contacts (notably Google-hosted) with more than one email address were not always editable
  • Address Book accessibility improvements
  • Various UI improvements
  • Icons converted to new style

New in Thunderbird 102.0 (Jul 4, 2022)

  • NEW:
  • Thunderbird will now display a message when an upgrade migration task is taking a long time to complete
  • es-MX localized build now available
  • What's new link displayed in About: dialog
  • Profile Import/Export UI refreshed and moved to a tab
  • Commandline tools now included for OpenPGP debugging
  • Thunderbird may now be built with OpenPGP support and a system librnp
  • Added menu option to permanently decrypt OpenPGP encrypted messages to a folder
  • OpenPGP: Public keys from email attachments and autocrypt headers now cached for future use
  • Expired OpenPGP recipient keys now indicated in compose window
  • OpenPGP Key Assistant enabled by default
  • OpenPGP Key Properties now supports refreshing keys from key server
  • Spaces vertical toolbar for easier in-app navigation
  • Compose toolbar button for OpenPGP & S/MIME signing available via "Customize Toolbar"
  • "Select all addresses" now supported from composer pill context menu
  • Multiple active spelling dictionaries now supported in compose window
  • Add dictionaries item added to Spelling button in compose window
  • Added config option to more aggressively warn sender about having many public recipients to an email (mail.compose.warn_public_recipients.aggressive)
  • Exporting current profile now supported on importing tab
  • Back/Forward keyboard shortcuts added to Addon Manager
  • New Address Book UI and significant backend overhaul
  • Importing sqlite address books now supported
  • Importing addressbooks via CSV file now supports semi-colon (;) delimited files
  • Opening a news:// URL now works if an account is not configured for that news server
  • Google Talk chat accounts now support logging in with OAuth2
  • Matrix chat support enabled by default. This is a beta feature.
  • Printing using the system dialog without preview now supported; Set print.prefer_system_dialog to true
  • Removing events from a calendar now prompts for confirmation
  • Upcoming events in the Today Pane show how far away they are
  • Icons now displayed on recurring events and modified events within a recurring series
  • CHANGES:
  • SMTP client will now ignore socket errors after QUIT command is sen
  • Javascript POP implementation enabled by default
  • Buttons on "Update Failed" popup now open Beta and Release specific pages on Thunderbird website
  • Replace "About Junk Mail" dialog with a link to the support page
  • [macOS] Account settings moved to application menu
  • New profiles will default to using "Threaded" message view
  • "Discover OpenPGP Key" context menu item is no longer displayed when a key is already available
  • Duplicated OpenPGP encrypted attachments were shown when display-attachments-inline was enabled
  • Replaced Security compose toolbar button with Encryption toggle and Encryption options buttons
  • OpenPGP dialog for key "acceptance per email" now displayed in more circumstances
  • OpenPGP Key Manager dialog layout improvements
  • Writing OpenPGP keyring data will block Thunderbird shutdown to prevent data loss
  • When automatically attaching OpenPGP keys to emails, Thunderbird will strip key certificates
  • A notification bar in the compose window will be displayed if encryption is possible but not enabled
  • Inline attachment filenames now sent without data-uri encoding
  • Per-recipient and per-domain email format preferences removed; Sending options moved to Compose Settings
  • Thunderbird can now be used without setting up a mail account
  • NNTP account set up moved to its own wizard; "Other accounts" wizard removed
  • Account Manager UI updated
  • Email account provisioner moved to a tab
  • Link to create a new email address in Account Setup now hidden if "Email address" contains a value
  • Addon Search will no longer display addons that are incompatible
  • Searching from the Themes page of Addon Manager will now limit search results to only include themes
  • Additional fields for download limits, expiration, and password protection added to FileLink template
  • FileLink will check the provider for sufficient space before uploading
  • "PreferMailFormat" property removed from addressbook
  • Address book contact data is now stored in the vCard format. The change isn't backwards-compatible; backups are stored in the profile directory.
  • Default install directory for Thunderbird Beta changed to not conflict with release versions
  • Tab icons updated
  • Message Header toolbar buttons will not display a border when set to show icons only
  • New message detection for non-INBOX IMAP folders improved
  • New Javascript NNTP implementation enabled by default; Set mailnews.nntp.jsmodule to false to disable
  • Preference for OTR encrypted conversation logging moved to Protocol settings
  • Thunderbird will not try to use OTR Chat encryption if the protocol supports native encryption
  • Invitations to IRC and XMPP chat rooms will now prompt the user if they would like to join
  • Today Pane UI refreshed
  • Thunderbird will not support "Secondly" or "Minutely" recurring calendar events
  • Default action of Edit button in recurring event dialog changed to display submenu
  • Support for importing and exporting calendars from Outlook CSV format was removed
  • Thunderbird will now delay refreshing cached calendars at start-up
  • Javascript Ical parser (ical.js) enabled by default
  • FIXES:
  • Opening "cid:" links failed
  • Message download progress was calculated incorrectly
  • Ctrl+mouse wheel did not zoom in the message source window
  • Open message in containing folder did not work for standalone windows
  • Multi-message view was not fully scrollable
  • Messages did not reload in all open windows after Junk status was changed
  • Detached attachments were opened from a temporary copy instead of the selected save location
  • IMAP folder subscription changes on servers using OAuth2 authentication were not reflected in folder pane until Thunderbird was restarted
  • Improved error reporting for external GnuPG configurations
  • Incorrect OpenPGP preferences were used for secondary identities
  • Adding an expiry date to an OpenPGP key that did not have one was not possible
  • UI showed old OpenPGP key expiry date after changing it
  • Importing large OpenPGP key files failed
  • OpenPGP "Repair Message" button did not work with some emails
  • Importing OpenPGP public keys without a blank line following the header failed
  • Dragging and dropping multiple email attachments between windows did not always copy all attachments
  • Attachment bar in message compose window was not keyboard accessible
  • Triggering recipient pill creation in the compose window incorrectly used the entire field as input
  • Compose notification bars were not easily accessible via keyboard
  • "Save message" confirmation dialog buttons were not navigable using arrow keys
  • Focus jumped in compose window when closing the contacts sidebar
  • Save dialog was incorrectly shown when closing empty composer windows
  • Incorrect access key used for File->New->Message menu item
  • Changing focus in the compose window with multiple recipient pills selected did not always deselect the pills
  • Sending a message with non-ascii characters in recipient local parts failed unexpectedly when the server did not support SMTPUTF8
  • LDAP Autoconfig could block Thunderbird startup
  • Improvements to the Import/Export feature
  • Configuring multiple SMTP accounts using the same server was not possible
  • Empty Trash on Exit did not work with IMAP accounts using OAuth2 authentication
  • IMAP server hostname changes were not reflected in Folder Properties dialog
  • Addons automatically updated when Thunderbird updated despite Addon updates being turned off
  • Message size calculations incorrectly included FileLink attachments
  • After converting a FileLink attachment back to an e-mail attachment, the privacy notification persisted
  • A failed FileLink provider change removed the attachment completely
  • Subscribing to CardDAV address books from Account Setup tab did not subscribe to all selected address books
  • Adding CardDAV address books failed if an addon-provided address book was present
  • Messages with Message-Id headers longer than 332 characters could not be forwarded
  • SMTP send progress bar could trigger high CPU usage when the server connection failed
  • Improved POP server authentication detection during Account Setup
  • News folders did not display biff indicator
  • IMAP flag changes from another client were not seen after some inactivity
  • Recipients were not de-duplicated before sending, leading to sending errors
  • Chat conversations' context menu did not recognize links
  • Chat username splitting in the account wizard did not work after changing protocols
  • Removing obsolete proprietary chat accounts did not work
  • OTR encrypted chat did not work on FreeBSD
  • Event edit toolbar button was not disabled when an invitation was selected
  • Event view headers and content were not lined up consistently for RTL locales
  • Mini-month views did not properly update at midnight
  • Some labels in Calendar were displayed in multiple languages
  • Thunderbird permitted inline editing of read-only event titles
  • Calendar view reloaded when switching tabs
  • It was possible to create annual calendar events with invalid days
  • Detection of attached vCalendar files improved
  • Reminders for events created by another user could not be closed
  • MS Teams meeting event descriptions were unreadable when stored on Google Calendar
  • adding a Google calendar with a non-gmail or googlemail e-mail address failed
  • Accepting a recurrence exception to an event accepted event associated with the original recurring event rather than the exception
  • Various security fixes

New in Thunderbird 91.10.0 (Jun 9, 2022)

  • Fixes:
  • Various UX and theme improvements
  • Various security fixes
  • Security Fixes:
  • https://www.mozilla.org/en-US/security/advisories/mfsa2022-22/#CVE-2022-1834

New in Thunderbird 91.9.1 (May 20, 2022)

  • Fixed:
  • Various security fixes

New in Thunderbird 91.9.0 (May 3, 2022)

  • FIXES:
  • CLIENTID extension to SMTP was not supported by smtp-js
  • Additional SMTP errors now propagated to user
  • OpenPGP was not able to use some previously supported key types
  • OpenPGP Key Manager did not always display correct information after importing additional IDs
  • Duplicate new mail notifications could be displayed when server-side filters were in use
  • Cancelling an SMTP password entry resulted in multiple failure dialogs being displayed

New in Thunderbird 91.8.1 (Apr 27, 2022)

  • FIXES:
  • CLIENTID extension to SMTP was not supported by smtp-js
  • Additional SMTP errors now propagated to user
  • OpenPGP was not able to use some previously supported key types
  • OpenPGP Key Manager did not always display correct information after importing additional IDs
  • Duplicate new mail notifications could be displayed when server-side filters were in use
  • Cancelling an SMTP password entry resulted in multiple failure dialogs being displayed

New in Thunderbird 91.8.0 (Apr 6, 2022)

  • Changes:
  • Google accounts using password authentication will be migrated to OAuth2.
  • FIXES:
  • OpenPGP ECC keys created by Thunderbird could not be imported into GnuPG
  • Exporting multiple public PGP keys from Thunderbird was not possible
  • Replying to a newsgroup message erroneously displayed a "No-reply" popup warning
  • Opening mid: URLs on macOS failed
  • Address books stored in older formats were loaded as SQLite files, causing a crash
  • Replicated LDAP directories were lost after switching Thunderbird to "Offline"`mode
  • Importing webcals from the commandline failed if the URI ended with an .ics file extension
  • Various security fixes

New in Thunderbird 91.6.2 (Mar 7, 2022)

  • FIXES:
  • Temporary files from opened attachments were saved with world-readable permission
  • Various security fixes

New in Thunderbird 91.6.1 (Feb 16, 2022)

  • WHAT'S NEW:
  • Thunderbird will now offer to send large forwarded attachments via FileLink
  • FIXES:
  • Partially signed unencrypted messages displayed an incorrect "partially encrypted" notification
  • Attachments filenames were not sanitized before saving to disk
  • In the attachment bar, the "Import OpenPGP Key" item displayed for public keys displayed an error and did not import the key
  • Open with" attachment dialog did not have a selected radio button option
  • Various security fixes

New in Thunderbird 91.6.0 (Feb 9, 2022)

  • WHAT'S NEW:
  • Thunderbird will now offer to send large forwarded attachments via FileLink
  • FIXES:
  • Partially signed unencrypted messages displayed an incorrect "partially encrypted" notification
  • Attachments filenames were not sanitized before saving to disk
  • In the attachment bar, the "Import OpenPGP Key" item displayed for public keys displayed an error and did not import the key
  • "Open with" attachment dialog did not have a selected radio button option
  • Various security fixes

New in Thunderbird 91.5.1 (Jan 25, 2022)

  • FIXES:
  • JS LDAP implementation did not support self-signed SSL certificates
  • After saving a draft and subsequently sending a FileLink email, the original file was removed from disk
  • Chat OTR encryption did not work
  • OTR verification bar was not removed after completing verification
  • Various theme improvements

New in Thunderbird 91.5.0 (Jan 12, 2022)

  • FIXES:
  • RSS keyword labels without a configured color were illegible
  • Thunderbird "about:" dialog did not identify third-party repackaged distributions such as Flatpaks
  • Various security fixes

New in Thunderbird 91.4.1 (Dec 20, 2021)

  • FIXES:
  • Attachments that should open in Thunderbird, such as ICS attachments, offered to save the file instead
  • Saving attachments from IMAP accounts where usernames contained special characters failed
  • Temporary files created for forwarded attachments sometimes had the wrong extension
  • S/MIME signatures were shown as invalid by Outlook
  • URL input boxes on content tabs erroneously displayed a search glass icon on macOS
  • Message bars (such as content blocking) did not use high contrast theme colors
  • Some messages with autocrypt headers loaded slowly, causing Thunderbird to hang
  • Server hostnames were cut-off in the account manager
  • Account Setup did not support non-ASCII characters in passwords
  • Account Setup did not always retain set values
  • Virtual folders did not retain folder selection when a folder name contained non-ASCII characters
  • Messages saved as "html" or "eml" did not include message headers
  • "Private web page" field was not included when exporting a contact to a vCard
  • Addons were still active after restarting Thunderbird in troubleshooting mode with "disable all addons" checked
  • FileLink attachments did not always display the FileLink provider's icon
  • FileLink privacy notifications persisted in the compose window after removing all FileLink attachments
  • "Loading" icon remained after a FileLink upload failed
  • Lengthy event names for multiday events did not wrap
  • Various theme and UX improvements
  • Various security fixes

New in Thunderbird 91.4.0 (Dec 8, 2021)

  • FIXES:
  • IMAP startup performance improved for accounts with a multitude of folders
  • Thunderbird failed to send messages when configured to use an IPv6 SMTP server by IP address (instead of a hostname)
  • Forwarding messages with attachments sometimes failed
  • Printing multiple messages at once was not possible
  • Non-utf8 news groups were not supported
  • Thunderbird stalled after sending a message with NNTP and SMTP recipients
  • Using Thunderbird with multiple language packs caused high RAM and CPU use and sluggish performance
  • Clicking a "mailto:" started the composer with the default sending identity instead of a configured alternate
  • Drag and dropped text into a plain text message in the compose window was handled inconsistently
  • FileLink messages did not display correctly when viewed in Outlook
  • In account setup, after selecting an extension provided protocol, it was not possible to create an IMAP/POP account
  • Multiday selections were not cleared when changing week viewed
  • When creating a new event by clicking and dragging the mouse to create a box, the view did not auto-scroll after reaching the bottom
  • Calendar Invitation Panel did not scroll when multiple invitations were pending
  • Calendar print dialog did not have a cancel button
  • Various security fixes

New in Thunderbird 91.3.2 (Nov 19, 2021)

  • CHANGES:
  • Date selection in Calendar print settings widget changed to use mini calendar widget
  • FIXED:
  • fixed:
  • "Repair Text Encoding" menu item did not work
  • Troubleshoot Mode menu item did not always indicate whether troubleshooting mode was enabled
  • Message content could be unintentionally hidden due to CSS class names conflicting
  • SMTP server port was reset to "0" after clicking the "Re-Test" button in the Account Setup wizard
  • No "Paste" option was available in the config editor (about:config) context menu
  • Saving a PDF attachment opened in a separate tab saved the email message instead
  • Opening a PDF attachment from a message in a standalone or compose window did move the focus to opened attachment
  • After restart, Thunderbird was not able to restore opened message tabs when the message was in a folder with non-ASCII characters in its name
  • The "pill" indicator was incorrectly shown when sending a message to newsgroup
  • When printing from Calendar, after leaving the "Calendar" settings, there was no way to go back
  • Month pickers in the Calendar print UI lacked scrollbars when the content overflowed
  • Account Manager and Addons Manager were unreadable when using the Dark theme

New in Thunderbird 91.3.1 (Nov 15, 2021)

  • FIXES:
  • Default mail headers were set incorrectly when the value contained a colon (:)
  • Thunderbird did not send the QUIT command when closing an SMTP connection
  • Mail tabs could not be closed using the context menu
  • "Print" context menu was still shown when no message pane was displayed
  • Windows tray icon did not reappear after restarting Windows Explorer
  • Compose window attachment drag and drop fixes
  • Various macOS stability improvements
  • Drag and Drop area for file attachments on Windows was incorrect
  • CardDAV address books without a name did not work
  • Thunderbird tried to refresh disabled and manual-only calendars when the network state changed from offline to online
  • Various Calendar event dialog fixes
  • Various security fixes

New in Thunderbird 91.2.1 (Oct 23, 2021)

  • NEW:
  • Preference added to disable automatic pausing RSS feed updates after a fetch failure
  • FIXES:
  • Recipeint address pills in an error state could incorrectly merge with mailing list pills when expanding the list
  • BCC-only messages could not be sent from the Outbox
  • Default DSN request was not set when using "Edit as New Message"
  • Vertical scrollbar in "Conversations" chat panel did not work correctly
  • Chat account "Advanced Options" dialog had no clickable buttons on macOS
  • RSS feed attachments could not be saved
  • Public ICS calendars served with an incorrect Content-Type could not be added
  • Setting a CalDAV calendar to manually update had no effect
  • CalDAV calendars set to read-only became writable after restarting Thunderbird
  • Saving a copy of a calendar invite (More -> Save As Copy) did not work
  • Events in the first or last week of a month were not always printed when printing a month view
  • Accessibility improvements; clearer display of area of focus
  • Various theme improvements, HiDPI improvements
  • "Attachments" menu panels for attached files were empty
  • Stability improvements

New in Thunderbird 91.2.0 (Oct 7, 2021)

  • Changes:
  • Thunderbird will now warn if an S/MIME encrypted message includes BCC recipients
  • Fixes:
  • Message Security popup did not display all recipients due a missing scrollbar
  • Delivery Status Notifications were only shown for the first recipient
  • Composing a message from a template with attachments failed due to a temporary file being removed
  • Attachment sizes were no longer included on printed emails
  • A message sent with multiple attachments sometimes only sent one
  • Thunderbird sometimes attached the wrong messages when forwarding multiple messages by attachment
  • Thunderbird did not re-prompt for an SMTP username if one was not provided
  • Messages with BCC recipients that were held in the Outbox did not retain the BCC header when moved to the Sent folder
  • Thunderbird displayed reminders for events that were cancelled or declined
  • New Feed Account dialog did not honor dark mode

New in Thunderbird 91.1.2 (Sep 28, 2021)

  • Changes:
  • Thunderbird will now warn if an S/MIME encrypted message includes BCC recipients
  • Fixes:
  • Message Security popup did not display all recipients due a missing scrollbar
  • Delivery Status Notifications were only shown for the first recipient
  • Composing a message from a template with attachments failed due to a temporary file being removed
  • Attachment sizes were no longer included on printed emails
  • A message sent with multiple attachments sometimes only sent one
  • Thunderbird sometimes attached the wrong messages when forwarding multiple messages by attachment
  • Thunderbird did not re-prompt for an SMTP username if one was not provided
  • Messages with BCC recipients that were held in the Outbox did not retain the BCC header when moved to the Sent folder
  • Thunderbird displayed reminders for events that were cancelled or declined
  • New Feed Account dialog did not honor dark mode

New in Thunderbird 91.1.1 (Sep 17, 2021)

  • What’s New:
  • Menu item for disabling subject encryption for a single message added
  • Changes:
  • Printing messages that are not currently displayed is no longer supported, including printing multiple messages at once
  • Fixes:
  • Buttons on compose window dialogs did not have a visual indication of focus
  • Dropdown fields in message compose window were unreadable on Windows 7 with a dark theme
  • Multiple bulk mail notification warnings were displayed
  • Enabled/Disabled state of message filters did not persist as expected
  • Printing a message did not print a list of its attachments
  • Images attached from a web page were not sent as expected
  • OpenPGP public key was attached multiple times when forwading a message
  • Windows tray icon disappeared if Thunderbird was started by a shortcut with "Run" set to "Minimized"
  • Windows tray message count badge displayed the "unread" count instead of the "new" message count
  • Some downstream Thunderbird builds were incorrectly checking addons for a signature, causing all addons to be disabled
  • Addressbooks set up with autoconfig showed no search results
  • Various CardDAV setup and auto-detection fixes
  • Dates (such as birthday) stored in contacts may display the wrong date; a one-time manual fix may be needed for dates that are incorrect.
  • Attached VCards displayed as plain text when an email was HTML formatted
  • Mailing list names with non-ASCII characters incorrectly displayed with an error
  • LDAP directories were not searched for matches when adding recipients to an email
  • Clicking "Connect to an LDAP address book" in account setup opened CardDAV setup dialog
  • LDAP address books using Kerberos/GSS-API authentication did not authenticate
  • LDAP search queries containing non-ASCII characters produced no results
  • IRC server connections did not automatically retry after a timeout
  • Calendar event editor did not honor mail.spellcheck.inline

New in Thunderbird 91.1.0 (Sep 14, 2021)

  • Changes:
  • VCard attachments now sent with "text/vcard" instead of "text/x-vcard"
  • FIXES:
  • Thunderbird registered Accessibility Handlers using same GUIDs as Firefox, causing performance issues for NVDA users
  • Focus lost when reordering accounts by keyboard in the Account Manager
  • Account setup did not use provider display name for setting up calendars
  • Various theme and UX fixes
  • Various security fixes

New in Thunderbird 91.0 (Aug 17, 2021)

  • NEW:
  • Native support for macOS devices built with Apple Silicon CPUs
  • Thunderbird now operates in multi-process (e10s) mode by default
  • Latvian language support
  • New user interface for adding attachments
  • Enable redirect of messages
  • Ability to change order of accounts in UI
  • Allow showing empty CC/BCC rows in compose window
  • Warning popup when sending a reply to a likely non-existant email address such as "[email protected]"
  • Warning popup when public recipients of a message exceeds threshold
  • Add support for "X-Unsent: 1" header, to open a saved email in a compose window for editing
  • Add support for non-ASCII characters in recipient addresses
  • Context menu to expand mail list pills in the compose window to the list of recipients
  • Quick Find is now available in the multi-message (thread summary) view
  • Keyboard shortcuts to access To/CC/BCC fields of compose window
  • Allow pinning folder views to the Folder Pane
  • Language packs and dictionaries added to about:support
  • PDF.js viewer now included in Thunderbird
  • OpenPGP: "Copy Key Id" option added to Key Manager context menu
  • OpenPGP: Added config option to disable encrypting saved drafts
  • Encrypt mail to BCC recipients (with warning that it will expose the recipients in the list of keys)
  • CardDAV address book support
  • CardDAV address books automatically detected based on provided user information
  • Access to Outlook Contacts; To enable, set ldap_2.servers.outlook.dirType to 3; This setting may cause startup delays.
  • Suggest replacements for discontinued/incompatible add-ons
  • Chat: Beta-level support for Matrix servers (set chat.prpls.prpl-matrix.disable to false)
  • Calendar: Remote calendar auto-detection now supported
  • Calendar: Calendar and category colors now displayed in selection dropdowns
  • Calendar: "Edit" item added to event context menu
  • Calendar: Support opening of .ics files by double-click
  • Calendar: Thunderbird now informs the operating system that it knows how to open webcal: URLs
  • Calendar: Filter and sort items to be imported in the Import dialog
  • Prompt to choose the identity of an accepted calendar invite when no identity matches the event attendees list
  • Support mid: URL scheme for Related Links in calendar event dialogs
  • Permissions to access calendar and address book are now requested when a GMail account is set up, so that calendar and address book can be accessed without having to re-authorize (see notes)
  • Calendar: Per-calendar and global notification settings (in addition to alerts set in events)
  • Tasks: Undo/Redo support for event and task creation and deletion
  • CHANGES:
  • "Master Password" renamed to "Primary Password"
  • Renamed "Add-ons" to "Add-ons and Themes" and "Options" to "Preferences"
  • Account setup moved to a tab
  • Mail recipients that are not found in any address book will no longer appear in red type; invalid addresses will appear red
  • Clicking on an already-selected pill in the recipient list will now allow editing the address
  • Folder pane color scheme overhauled with a focus on readability
  • Sending backend, SMTP protocol, and LDAP protocol implementations rewritten in Javascript
  • Sending backend, SMTP, and IMAP protocols now operate only in UTF-8 mode
  • Sending a message will now fail if any recipients are not accepted by the SMTP server
  • Error messages from an SMTP server are now displayed to the user
  • UI Customization controls moved to the View menu
  • End-to-End Encryption "Advanced Settings" are now disabled when encryption is not configured
  • Movemail support removed
  • WeTransfer FileLink provider removed
  • Enterprise policies updated
  • Printing UI updated
  • AutoComplete from LDAP directories now searches by substring instead of left-side match
  • Chat modules and custom widgets are now lazy-loaded to improve Thunderbird startup time
  • Default IRC server for new chat accounts changed to "libera.chat"
  • Chat: Image based emoticons replaced with Unicode
  • Calendar: Opening an existing event now opens summary dialog
  • Calendar: Default to CalDAV when supported by the server
  • FIXES:
  • Thunderbird did not properly handle Self-signed certificates on IMAP servers
  • Various issues with special and non-ASCII characters in IMAP folders names, especially on Gmail
  • Drag & drop operations could be disrupted by incoming mail notifications
  • Dragging a folder from an authenticated IMAP server to a not-yet authenticated server fails
  • Temporary errors from POP3 servers would cause Thunderbird to stop downloading mail until it was restarted
  • Favorite Folder view did not maintain UI state between Thunderbird restarts
  • Saved search virtual folders were not retained after restarting Thunderbird
  • Thunderbird did not correctly warn about all affected filters when removing a folder
  • Manually running filters on a maildir folder did not work
  • Partially downloaded messages displayed in a stand-alone window did not refresh after clicking link to download the rest of the message
  • An erroneous "Sender" header was displayed in the message preview after viewing certain S/MIME signed emails
  • Some temporary files created by the message composer were not automatically removed after closing the compose window
  • Archiving messages from an NNTP account made the target folder unusable
  • Compose window: The user-configured style for quoted text was not honored
  • Message headers in compose window disregarded manual resizing when adding additional recipients
  • Various improvements to new message notifications
  • A Thunderbird icon pinned to the Windows taskbar reverted to a non-functional placeholder after an update
  • Various improvements to recipient pills in message compose window
  • Keyboard shortcut to open the Message Security popup did not work on Mac
  • Subject column in message lists sometimes showed text from invalid email headers
  • Account settings: When creating a new account, some already entered settings did not copy to the Advanced Config dialog
  • Default address book preference was not honored in the contacts sidebar
  • Import Address Book from CSV did not not allow mapping all available fields
  • LDAP address books did not display multi-valued attributes
  • Address Book: Users with LDAP admin rights could delete accounts if trying to delete an entry from an address book backed by LDAP
  • Some preferences related to an address book were not removed when the address book was deleted
  • Shortcut for Advanced Address Book Search (Ctrl+Shift+F) did not work on Linux
  • Radio buttons could not be selected on photo tab of an address card
  • Windows uninstaller did not always remove all Thunderbird program files
  • Chat: Double clicking an account type in new account wizard did not select it
  • Chat account settings did not always save as expected
  • User nickname colors were not used in chat content
  • Chat: Multiple system messages did not collapse
  • Calendar: Reminder details appeared editable when viewing an event
  • Calendar: HTML rendering in event descriptions restored
  • Calendar: The toolbar in the invitation details dialog was not honoring the theme colors
  • Calendar: Various dialog updates
  • Calendar: Import and export via CSV did not parse years correctly in event dates
  • Calendar: Event boxes were not always focused when clicked
  • Dragging and dropping an ICS file to the Today Pane did not populate the "New Event" dialog
  • Calendar: Reduced flickering effect in Today Pane
  • Calendar: The time of day indicator line did not update automatically
  • Location field was not preserved when modifying recurring events stored on a remote calendar
  • Today was difficult to pick out visually in the month/multiweek calendar views
  • Columns in Today Pane were not resizable
  • Calendar event text could render outside the confines of the event block
  • Event time and event name were not vertically aligned
  • Improved formatting of event descriptions with long links, such as Zoom invites
  • RSVP replies to invitations sometimes sent from the wrong email address
  • Various UI and theme improvements, especially to dark themes
  • Various security fixes

New in Thunderbird 78.13.0 (Aug 11, 2021)

  • CHANGES:
  • WeTransfer FileLink provider removed
  • The fix for bug 1707360, from Thunderbird 78.12.0, was removed for causing regressions
  • FIXES:
  • OpenPGP: Homebrew's GPG Smartcard libraries not found on M1 Macs
  • Various security fixes

New in Thunderbird 78.12.0 (Jul 14, 2021)

  • Fixes:
  • Sending an email containing HTML links with spaces in the URL sometimes resulted in broken links
  • Folder Pane display theme fixes for macOS
  • Chat account settings did not always save as expected
  • RSS feed subscriptions sometimes lost
  • Calendar: A parsing error for alarm triggers of type "DURATION" caused sync problems for some users
  • Various security fixes

New in Thunderbird 78.11.0 (Jun 3, 2021)

  • Fixes:
  • OpenPGP could not be disabled for an account if a key was previously configured
  • Recipients were unable to decrypt some messages when the sender had changed the message encryption from OpenPGP to S/MIME
  • Contacts moved between CardDAV address books were not synced to the new server
  • CardDAV compatibility fixes for Google Contacts
  • Folder pane had no clear indication of focus on macOS
  • Windows theme improvements
  • Various security fixes

New in Thunderbird 78.10.1 (May 6, 2021)

  • Changes:
  • Removed the fix for bug 1689804 introduced in Thunderbird 78.9.0, restoring the previous behavior
  • Fixes:
  • Various security fixes

New in Thunderbird 78.10.0 (Apr 29, 2021)

  • Fixes:
  • Various security fixes

New in Thunderbird 78.8.1 (Mar 9, 2021)

  • Fixes:
  • New mail notification did not occur for newly arrived messages if previously received mail was unread
  • Directory for saving multiple attachments was not remembered between saves
  • Opening a message from the command-line using "-mail " failed
  • Automatic account setup did not use the provider email and display name
  • Newly-added identities were not listed in the account manager until it was closed and reopened
  • Account provisioner did not properly handle UTF-8 data
  • Copying a large message to an IMAP server would sometimes prematurely display a time-out error
  • OpenPGP: Various errors when importing keys
  • OpenPGP: Public keys attached to an outgoing email did not have "Content-Description" set
  • Address Book: CardDAV sync errors did not retry until Thunderbird was restarted
  • Calendar: Changing the cache mode of a CalDAV calendar connection would lose the username of the account
  • Calendar: Add-on calendars were sometimes not visible after restarting
  • Calendar: The preview for a recurring task did not use all available space in the dialog window
  • Installer: Option to keep distribution directory on upgrade did not work

New in Thunderbird 78.8.0 (Feb 24, 2021)

  • Fixes:
  • Importing an address book from a CSV file always reported an error
  • Security information for S/MIME messages was not displayed correctly prior to a draft being saved
  • Calendar: FileLink UI fixes for Caldav calendars
  • Recurring tasks were always marked incomplete; unable to use filters
  • Various UI widgets not working
  • Dark theme improvements
  • Extension manager was missing link to addon support web page
  • Various security fixes

New in Thunderbird 78.7.1 (Feb 7, 2021)

  • What’s New:
  • CardDAV address books now support OAuth2 and Google Contacts.
  • Changes:
  • Thunderbird will no longer allow installation of addons that use legacy APIs
  • Fixes:
  • Send message button sometimes remained enabled when it should be disabled
  • Pressing command+enter to send a message on macOS did not work
  • OpenPGP: Failed to save attachments that contained binary data after decryption
  • Global search UI fixes
  • Various theme and color fixes to improve ease of use

New in Thunderbird 86.0 Beta 1 (Jan 29, 2021)

  • What’s New:
  • Allow pinning folder views to the Folder Pane
  • Changes:
  • Message addressees that are not found in any address book will no longer appear in red type; invalid addresses will appear red
  • Reenabled javascript-based message sending code by default
  • Folder pane color scheme overhauled with a focus on readability
  • Calendar: Imported events are not sorted before being displayed
  • Fixes:
  • Thunderbird did not properly handle Self-signed certificates on IMAP servers
  • Pressing command+enter to send a message on macOS did not work
  • Saving an image from a message body with "Save Image As" did not work
  • Various issues with IMAP folders with non-ASCII names, especially on Gmail
  • OpenPGP: Failed to save attachments that contained binary data after decryption
  • Various global search fixes
  • Importing an address book from a CSV file always reported an error
  • Windows uninstaller did not always remove all Thunderbird program files
  • Calendar: HTML entities appeared in event and task descriptions
  • Calendar: FileLink UI fixes for Caldav calendars
  • Calendar: Various dialog updates
  • MailExtension options pages did not always completely load
  • Known Issues:
  • Various updater issues

New in Thunderbird 78.7.0 (Jan 27, 2021)

  • What’s New:
  • Extension API: Compose API now supports editing messages and templates as new messages
  • Extension API: composeHtml is now exposed in MailIdentity
  • Extension API: windows.update and windows.create now support titlePreface
  • Extension API: new Accounts API functions: accounts.getDefault() and accounts.getDefaultIdentity(accountId)
  • Changes:
  • Extension API: body and plainTextBody are now used as compose mode selectors in setComposeDetails and begin* functions in Compose API
  • Theme: removed the double border around the task description field on the Tasks tab
  • Fixes
  • Account Manager: When deleting the last remaining account, the default account was not getting cleared and still pointed to the no-longer-existing account
  • OpenPGP: Verification of an inline signed message would fail if it contained leading whitespace
  • OpenPGP: Various other minor bug and stability fixes
  • Mail Window: Quickfilter bar buttons disappear when hovered on Windows 10 High Contrast Black theme
  • Theme: folder properties dialog contained black text on a black background in dark mode
  • Theme: recipient pills in compose window were not visible in high contrast dark theme on Windows 10
  • Extension API: browserAction buttons were not restored after restart if they were moved outside the default toolbar
  • Extension API: browser.compose.beginNew could not override identity plaintext setting
  • Extension API: browser.compose.beginForward was ignoring ComposeDetails
  • Extension API: browser.compose.setComposeDetails did not properly handle Windows-style line endings
  • Various security fixes
  • Known Issues:
  • Thunderbird performs sluggishly on macOS Big Sur

New in Thunderbird 78.6.1 (Jan 12, 2021)

  • Changes:
  • MailExtensions: browserAction, composeAction, and messageDisplayAction toolbar buttons now support label and default_label properties
  • Fixes:
  • Running a quicksearch that returned no results did not offer to re-run as a global search
  • Message search toolbar fixes
  • Very long subject lines distorted the message compose and display windows, making them unusable
  • Compose window: Recipient addresses that had not yet been autocompleted were lost when clicking Send button
  • Compose window: New message is no longer marked as "changed" just from tabbing out of the recipient field without editing anything
  • Account autodiscover fixes when using MS Exchange servers
  • LDAP address book stability fix
  • Messages with invalid vcard attachments were not marked as read when viewed in the preview window
  • Chat: Could not add TLS certificate exceptions for XMPP connections
  • Calendar: System timezone was not always properly detected
  • Calendar: Descriptions were sometimes blank when editing a single occurrence of a repeating event
  • Various printing bugfixes
  • Visual consistency and theme improvements
  • Various security fixes

New in Thunderbird 85.0 Beta 3 (Jan 5, 2021)

  • What’s New:
  • If a message fails to send, a message is now logged in the console tab of the Developer Toolbox which identifies which message failed to send
  • Address book: Added support for OAuth2 CardDAV providers
  • Calendar: Thunderbird now informs the operating system that it knows how to open webcal: and webcals: URLs
  • MailExtensions: Added the capability to query a specific headerMessageId via extension API which is persistent across application restarts
  • MailExtensions: new functions: accounts.getDefault() and accounts.getDefaultIdentity(accountId)
  • Changes:
  • The UI Customization controls formerly in the Customize submenu have all been moved into the View menu
  • Address book: CardDAV is now enabled by default (it was previously behind a hidden preference and off by default)
  • Calendar: Opening an event in the Today pane now opens the event summary
  • Calendar: When creating a new calendar, CalDAV is now used by default when supported by the server
  • MailExtensions: setComposeDetails and begin* functions of compose API now use body and plainTextBody as compose mode selectors
  • MailExtensions: Variable names for accessing notifications have changed
  • MailExtensions: Read-only address books now accessible
  • MailExtensions: messages.list(folder) on a non-existent folder now throws an ExtensionError exception
  • Fixes:
  • Various printing bugfixes
  • Various message search toolbar fixes
  • Address book: Read-only CardDAV address books were writable
  • Address book: Autocomplete suggestions did not appear next to the field when editing address book entries with an IME enabled
  • Address book: Default address book preference was not honored
  • Compose window: The user-configured style for quoted text was not honored
  • Compose window: Recipient addresses that had not yet been autocompleted were lost when clicking Send button
  • Compose window: New message is no longer marked as "changed" just from tabbing out of the recipient field without editing anything
  • Calendar: System timezone was not always properly detected
  • Calendar: The toolbar in the invitation details dialog was not honoring the theme colors
  • Account settings: When creating a new account, some already entered settings did not copy to the Advanced Config dialog
  • Account settings: When updating the title of a news & blogging type account, the title of the tab did not change
  • Chat: Could not add TLS certificate exceptions for XMPP connections
  • MailExtensions: browserActions moved to a different toolbar are now properly displayed after restarting Thunderbird
  • MailExtensions: browser.compose.beginNew was not properly honoring plaintext vs HTML settings
  • MailExtensions: browser.compose.setComposeDetails did not properly handling Windows-style line endings
  • MailExtensions: windows.create and windows.update did not honor the titlePrefix parameter
  • MailExtensions: messages.getFull() did not return all parts with OpenPGP enabled

New in Thunderbird 85.0 Beta 2 (Jan 5, 2021)

  • Fixes:
  • Sending messages and saving drafts with attachments that were copy & pasted into the compose window could fail
  • Calendar: Descriptions were sometimes blank when editing a single occurrence of a repeating event
  • LDAP address book stability fix

New in Thunderbird 85.0 Beta 1 (Dec 20, 2020)

  • What’s New:
  • If a message fails to send, a message is now logged in the console tab of the Developer Toolbox which identifies which message failed to send
  • Address book: Added support for OAuth2 CardDAV providers
  • Calendar: Thunderbird now informs the operating system that it knows how to open webcal: and webcals: URLs
  • MailExtensions: Added the capability to query a specific headerMessageId via extension API which is persistent across application restarts
  • MailExtensions: new functions: accounts.getDefault() and accounts.getDefaultIdentity(accountId)
  • Changes:
  • The UI Customization controls formerly in the Customize submenu have all been moved into the View menu
  • Address book: CardDAV is now enabled by default (it was previously behind a hidden preference and off by default)
  • Calendar: Opening an event in the Today pane now opens the event summary
  • Calendar: When creating a new calendar, CalDAV is now used by default when supported by the server
  • MailExtensions: setComposeDetails and begin* functions of compose API now use body and plainTextBody as compose mode selectors
  • MailExtensions: Variable names for accessing notifications have changed
  • MailExtensions: Read-only address books now accessible
  • MailExtensions: messages.list(folder) on a non-existent folder now throws an ExtensionError exception
  • Fixes:
  • Various printing bugfixes
  • Various message search toolbar fixes
  • Address book: Read-only CardDAV address books were writable
  • Address book: Autocomplete suggestions did not appear next to the field when editing address book entries with an IME enabled
  • Address book: Default address book preference was not honored
  • Compose window: The user-configured style for quoted text was not honored
  • Compose window: Recipient addresses that had not yet been autocompleted were lost when clicking Send button
  • Compose window: New message is no longer marked as "changed" just from tabbing out of the recipient field without editing anything
  • Calendar: System timezone was not always properly detected
  • Calendar: The toolbar in the invitation details dialog was not honoring the theme colors
  • Account settings: When creating a new account, some already entered settings did not copy to the Advanced Config dialog
  • Account settings: When updating the title of a news & blogging type account, the title of the tab did not change
  • Chat: Could not add TLS certificate exceptions for XMPP connections
  • MailExtensions: browserActions moved to a different toolbar are now properly displayed after restarting Thunderbird
  • MailExtensions: browser.compose.beginNew was not properly honoring plaintext vs HTML settings
  • MailExtensions: browser.compose.setComposeDetails did not properly handling Windows-style line endings
  • MailExtensions: windows.create and windows.update did not honor the titlePrefix parameter
  • MailExtensions: messages.getFull() did not return all parts with OpenPGP enabled

New in Thunderbird 78.6.0 (Dec 20, 2020)

  • What’s New:
  • MailExtensions: Added browser.windows.openDefaultBrowser()
  • Changes:
  • Thunderbird now only shows quota exceeded indications on the main window
  • MailExtensions: menus API enabled in messages being composed
  • MailExtensions: Honor allowScriptsToClose argument in windows.create API function
  • MailExtensions: APIs that returned an accountId will reflect the account the message belongs to, not what is stored in message headers
  • Fixes:
  • Keyboard shortcut for toggling message "read" status not shown in menus
  • OpenPGP: After importing a secret key, Key Manager displayed properties of the wrong key
  • OpenPGP: Inline PGP parsing improvements
  • OpenPGP: Discovering keys online via Key Manager sometimes failed on Linux
  • OpenPGP: Encrypted attachment "Decrypt and Open/Save As" did not work
  • OpenPGP: Importing keys failed on macOS
  • OpenPGP: Verification of clear signed UTF-8 text failed
  • Address book: Some columns incorrectly displayed no data
  • Address book: The address book view did not update after changing the name format in the menu
  • Calendar: Could not import an ICS file into a CalDAV calendar
  • Calendar: Two "Home" calendars were visible on a new profile
  • Calendar: Dark theme was incomplete on Linux
  • Dark theme did not apply to new mail notification popups
  • Folder icon, message list, and contact side bar visual improvements
  • MailExtensions: HTTP refresh in browser content tabs did not work
  • MailExtensions: messageDisplayScripts failed to run in main window
  • Various security fixes
  • Known Issues:
  • Thunderbird performs sluggishly on macOS Big Sur

New in Thunderbird 84.0 Beta 3 (Dec 6, 2020)

  • What’s New:
  • MailExtensions: Added browser.windows.openDefaultBrowser()
  • Changes:
  • MailExtensions: APIs that returned an accountId will reflect the account the message belongs to, not what is stored in message headers
  • MailExtensions: browserAction, composeAction, and messageDisplayAction toolbar buttons now support label and default_label properties
  • Fixes:
  • Running a quicksearch that returned no results did not offer to re-run as a global search
  • OpenPGP: When signature verification failed on an unencrypted message, Thunderbird incorrectly reported that the message was encrypted and could not be decrypted
  • Address book: Some columns incorrectly displayed no data
  • Address book: The address book view did not update after changing the name format in the menu
  • Calendar: Dark theme was incomplete on Linux
  • Calendar: Could not import an ICS file into a CalDAV calendar
  • Known Issues:
  • Printing from calendar does not work

New in Thunderbird 78.5.1 (Dec 2, 2020)

  • What’s New:
  • OpenPGP: Added option to disable email subject encryption
  • Changes:
  • OpenPGP public key import now supports multi-file selection and bulk accepting imported keys
  • MailExtensions: getComposeDetails will wait for "compose-editor-ready" event
  • Fixes:
  • New mail icon was not removed from the system tray at shutdown
  • "Place replies in the folder of the message being replied to" did not work when using "Reply to List"
  • Thunderbird did not honor the "Run search on server" option when searching messages
  • Highlight color for folders with unread messages wasn't visible in dark theme
  • OpenPGP: Key were missing from Key Manager
  • OpenPGP: Option to import keys from clipboard always disabled
  • The "Link" button on the large attachments info bar failed to open up Filelink section in Options if the user had not yet configured Filelink
  • Address book: Printing members of a mailing list resulted in incorrect output
  • Unable to connect to LDAP servers configured with a self-signed SSL certificate
  • Autoconfig via LDAP did not work as expected
  • Calendar: Pressing Ctrl-Enter in the new event dialog would create duplicate events
  • Various security fixes

New in Thunderbird 78.5.0 (Nov 27, 2020)

  • What’s New:
  • OpenPGP: Added option to disable attaching the public key to a signed message
  • MailExtensions: "compose_attachments" context added to Menus API
  • MailExtensions: Menus API now available on displayed messages
  • Changes:
  • MailExtensions: browser.tabs.create will now wait for "mail-delayed-startup-finished"
  • Fixes:
  • OpenPGP: Support for inline PGP messages improved
  • OpenPGP: Message security dialog showed unverified keys as unavailable
  • Chat: New chat contact menu item did not function
  • Various theme and usability improvements
  • Various security fixes

New in Thunderbird 78.4.3 (Nov 18, 2020)

  • Fixes:
  • User interface was inconsistent when switching from the default theme to the dark theme and back to the default theme
  • Email subject would disappear when hovering over it with the mouse when using Windows 7 Classic theme
  • Known Issues:
  • Message list is not focused at startup

New in Thunderbird 78.4.2 (Nov 10, 2020)

  • Fixes:
  • Security fix

New in Thunderbird 78.4.1 (Nov 6, 2020)

  • What’s New:
  • Thunderbird prompts for an address to use when starting an email from an address book entry with multiple addresses
  • Fixes:
  • Searching global search results did not work
  • Link location was not focused by default when adding a hyperlink in message composer
  • Advanced address book search dialog was unusable
  • Encrypted draft reply emails lost "Re:" prefix
  • Replying to a newsgroup message did not open the compose window
  • Unable to delete multiple newsgroup messages
  • Appmenu displayed visual glitches
  • Visual glitches when selecting multiple messages in the message pane and using Ctrl+click
  • Switching between dark and light mode could lead to unreadable text on macOS
  • Known Issues:
  • Message list is not focused at startup

New in Thunderbird 78.4.0 (Oct 22, 2020)

  • What’s New:
  • MailExtensions: browser.tabs.sendMessage API added
  • MailExtensions: messageDisplayScripts API added
  • Changes:
  • Yahoo and AOL mail users using password authentication will be migrated to OAuth2
  • MailExtensions: messageDisplay APIs extended to support multiple selected messages
  • MailExtensions: compose.begin functions now support creating a message with attachments
  • Fixes:
  • Thunderbird could freeze when updating global search index
  • Multiple issues with handling of self-signed SSL certificates addressed
  • Recipient address fields in compose window could expand to fill all available space
  • Inserting emoji characters in message compose window caused unexpected behavior
  • Button to restore default folder icon color was not keyboard accessible
  • Various keyboard navigation fixes
  • Various color-related theme fixes
  • MailExtensions: Updating attachments with onBeforeSend.addListener() did not work
  • Various security fixes

New in Thunderbird 78.3.2 (Oct 7, 2020)

  • Changes:
  • Thunderbird will no longer automatically install updates when Preferences tab is opened
  • Fixes:
  • OpenPGP: Improved support for encrypting with subkeys
  • OpenPGP: Encrypted messages with international characters were sometimes displayed incorrectly
  • Single-click deletion of recipient pills with middle mouse button restored
  • Searching an address book list did not display results
  • Windows installer was unreadable with Windows in high contrast mode
  • Dark mode, high contrast, and Windows theming fixes
  • Known Issues:
  • Message list is not focused at startup

New in Thunderbird 78.3.1 (Sep 27, 2020)

  • Fixes:
  • Thunderbird crashed after updating to 78.3.0

New in Thunderbird 78.3.0 (Sep 27, 2020)

  • Changes:
  • OpenPGP: Improved decryption performance with large messages
  • OpenPGP: Do not show external key UI when disabled by preference
  • Account setup wizard will now open a popup when connecting to a server with a self-signed SSL/TLS certificate
  • Installation of "legacy" MailExtensions now disabled
  • Reply-To header moved in compose window; now appears under From header
  • Calendar: Sidebar UI improvements
  • Fixes:
  • Selecting "Cancel" on the Master Password prompt at startup incorrectly reported corrupted OpenPGP data
  • OpenPGP: Creating a new key pair did not automatically select it for use
  • Dragging & Dropping recipient pills resulted in lost pills when an error was present
  • Spellcheck suggestions were unreadable in dark theme
  • Calendar: Multiple password prompts opened
  • Linux Distributions: UI was not rendered completely when built without updater
  • MailExtensions: browser.folders.delete failed on IMAP folders
  • Various security fixes
  • Known Issues:
  • Message list is not focused at startup

New in Thunderbird 78.2.2 (Sep 11, 2020)

  • What’s New:
  • Drag and Drop reordering of recipient pills now supported
  • Changes:
  • OpenPGP: Some signature states reported as "mismatch" now report "unknown"
  • Privacy policy now displayed in a tab when updated
  • Chat: Non-functional Twitter support removed
  • Fixes:
  • OpenPGP: Improvements to key importing when failures occur
  • OpenPGP: Decryption did not work with certain HTTP proxy configurations
  • OpenPGP: "Discover keys online" option did not work when searching for an email address
  • Email filters reported failure when moving a message to original folder
  • Message filters: Filters shown as enabled in configuration dialog were not always enabled
  • vCard 2.1 attachments not handled properly
  • Sending messages sometimes failed when recipients were in LDAP address book
  • Non-functional help menu items removed
  • Calendar: Event reminder details were unreadable
  • Windows 10 high-contrast theme fixes
  • More theme fixes and improvements
  • MailExtensions: Adding custom headers with mail.compose.other.header did not work
  • Known Issues:
  • Selecting "Cancel" on the Master Password prompt at startup incorrectly reports corrupted OpenPGP data.

New in Thunderbird 78.2.1 (Aug 30, 2020)

  • Changes:
  • OpenPGP enabled by default
  • OpenPGP: Disabled the use of MD5/SM2/SM3 algorithms
  • Fixes:
  • OpenPGP: Users with sub-identities were unable to encrypt or sign messages when switching identities
  • OpenPGP message security window did not support dark mode

New in Thunderbird 78.2.0 (Aug 30, 2020)

  • Changes:
  • OpenPGP Key generation now disabled when there is no default mail account configured
  • OpenPGP: Encrypt saved drafts when OpenPGP is enabled
  • Twitter search removed
  • Calendar: Event summary dialog is now themeable
  • MailExtensions: Some APIs now use defineLazyPreferenceGetter in order to benefit from
  • Fixes:
  • OpenPGP Key Manager search function did not work
  • OpenPGP Key Properties dialog was sometimes too small
  • OpenPGP: Encrypted email would not send if address contained uppercase characters
  • OpenPGP: "Key ID" column could not be resized in Key Manage
  • OpenPGP: Keys containing invalid UTF-8 strings could not be imported
  • OpenPGP: Enable automatic signing for encrypted messages in additional scenarios
  • Many more OpenPGP bug fixes and improvements
  • IMAP fetch chunk size was always 65536 bytes
  • IMAP server capabilities were not rechecked after upgrading to SSL/TLS connection
  • Message Composer: Order of attachments could not be modified using drag & drop
  • Composing messages with a "fixed width" font did not work
  • Drag and drop of address book contacts did not work in some situations
  • Address book migration failed when there was a dot in the file name
  • Address book: "Always prefer display name over message header" was always checked when editing a contact
  • Address book performance optimizations
  • Dialog to add a new mail account from "Account Settings" did not open
  • "Select All" (Ctrl+A) in message source did not work until focused with a mouse click
  • Ctrl+scroll wheel not zooming in message reader
  • Setting/changing a signature from a file lost when closing account settings
  • Adaptive Junk Mail settings could not be disabled
  • Message filter dialog fixes: Missing scrollbar, drop-down list not wide enough
  • Various UX and theme improvements

New in Thunderbird 78.1.1 (Aug 7, 2020)

  • Changes:
  • Building OpenPGP shared library linked to system libraries now supported
  • MailExtension errors now shown in Developer Tools console by default
  • MailExtensions: Dynamic registration of calendar providers now supported
  • Fixes:
  • OpenPGP improvements
  • Message preview was sometimes blank after upgrading from Thunderbird 68
  • Email addresses whitelisted for remote content not displayed in preferences
  • Importing data from Seamonkey did not work
  • Renaming a mail list did not update the side bar
  • MailExtensions: messenger.* namespace was undefined
  • Known Issues:
  • Mail header toolbar (Reply, Forward, Archive, Junk buttons) no longer configurable
  • Fixed width font not working in compose window

New in Thunderbird 78.1.0 (Aug 7, 2020)

  • What’s New:
  • OpenPGP support is now feature complete. Improvements: new Key Wizard, online searching for OpenPGP keys, and more
  • The preferences tab now has a search field
  • Changes:
  • Dark background in message reader is now disabled
  • Fixes:
  • Thunderbird startup was slow when using folder color customizations with many folders. Previously configured colors will not be migrated.
  • Mail quota usage in status bar did not support terabyte folder sizes
  • Changing Junk mail settings with keyboard toggled wrong setting
  • Advanced IMAP server preferences not saved in Account Manager
  • Address book migration updates and fixes
  • Address book: Last Modified Date was not updated
  • Dark mode improvements
  • Various security fixes

New in Thunderbird 78.0.1 (Jul 22, 2020)

  • What’s New:
  • OpenPGP: Key revocation, extending key expiration, and secret key backup
  • Fixes:
  • Drag & Drop multiple attachments to macOS Finder created duplicate files
  • Faceted search date and relevance settings not saved
  • FileLink attachments included as a link and file when added from a network drive via drag & drop
  • About Thunderbird dialog keyboard shortcuts did not work
  • CC'd recipients sometimes displayed collapsed in header pane
  • Incremental search in contacts sidebar did not always display local results when an LDAP server was also in use
  • Contacts sidebar search results cleared after removing a contact
  • OpenPGP: Messages with long Armor Header lines did not display
  • OpenPGP: Messages containing non-UTF-8 text were not supported
  • Various UI and theming fixes
  • Chat: Participants list did not display operator flags

New in Thunderbird 78.0 (Jul 19, 2020)

  • What’s New:
  • New Account Hub for centralized account setup
  • Redesigned recipient address fields (To, Cc, Bcc) as single-line input fields (pills) for multiple addresses instead of one line per address. More improvements to come.
  • Color customization of Folder Pane icons
  • Allow selecting messages via selection boxes instead of classic selection. "Select Messages" column needs to be selected via the thread pane's column picker.
  • "Delete" action column in thread pane (message list). "Select Messages" column needs to be selected via the thread pane's column picker.
  • Themes can be previewed in the Add-On Manager
  • Minimize to tray support added for Windows
  • New config option to anonymize message date header
  • Global Search menu item in app menu
  • Additional Enterprise policies
  • Calendar: Added ICS import support to -file command line option
  • Calendar: Add event preview to ICS import dialog
  • Chat: OTR messaging support
  • Chat: IRC echo-message capability
  • Changes:
  • Add-on support: As of version 78.0, Thunderbird only supports MailExtensions and MailExtension Experiments. Restartless add-ons and non-restartless legacy add-ons using XUL overlays are no longer supported.
  • Linux minimum runtime requirements have changed: GTK 3.14, GLIBC 2.17, libstdc++ 4.8.1 Details
  • Thunderbird Options/Preferences tab redesigned and with new user interface
  • Account creation dialog redesigned and with new user interface
  • Account Manager moved to a tab
  • Add-ons manager with new user interface and notifications
  • Improved "Recent" folder list for "Move to" and "Copy to" in message context menu
  • Improved UI of global search results tab
  • Improvements to the location bar of a tab displaying web pages
  • Use scalable icons throughout Thunderbird to improve support for HiDPI monitors and dark mode
  • Thunderbird will now ask for OS account password before displaying saved passwords
  • Address books are now stored as SQLite databases to prepare for future addressbook improvements. Existing address books in MAB format (using a Mork database) will be converted.
  • New parser and formatter for vCard. vCard versions 3.0 and 4.0 are now supported.
  • Various theme and dark mode improvements
  • Various look and feel improvements
  • Improved dialog for folder compaction (purging of deleted messages)
  • Graphics hardware acceleration is now enabled by default
  • TLS 1.0 and 1.1 disabled
  • Calendar: The Lightning calendar add-on is now integrated into Thunderbird
  • Calendar: Lightning version removed from Thunderbird user agent string
  • Calendar: Web Calendar Access Protocol (WCAP) support removed
  • Calendar: Storage access is now asynchronous to improve performance
  • Calendar: Location URLs are now clickable
  • Addon Developers: Updates to and expansion of MailExtensions APIs. Details
  • Fixes:
  • Password display font had characters that were difficult to read
  • When copying messages from an IMAP folder to a local folder, offline store wasn't used
  • While Thunderbird was in safe mode, the help menu did not offer an item to restart with add-ons enabled
  • Mailbox quotas not displayed correctly
  • Images not rotated when composing a message
  • Email addresses sometimes displayed incorrectly in message composer
  • Many accessibility fixes and improvements: message composer, account setup, attachment pane
  • Mailbox format conversion fixes
  • Address book improvements: exporting, editing contacts, contact photos
  • Chat: Renaming contacts in context menu did not work
  • Calendar: Task and event dialogs were sometimes too small for their content
  • Calendar: URLs in the event reminder dialog were not clickable
  • Various security fixes
  • Known Issues:
  • Mail header toolbar (Reply, Forward, Archive, Junk buttons) no longer configurable
  • Preferences search not available
  • Drag and drop of address book contacts not working in some situations

New in Thunderbird 68.4.1 (Jan 13, 2020)

  • Changed:
  • Various improvements when setting up an account for a Microsoft Exchange server: Now offers IMAP/SMTP if available, better detection for Office 365 accounts; re-run configuration after password change.
  • Fixed:
  • Attachments with one or more spaces in their names couldn't be opened under some circumstances
  • After changing view layout, the message display pane showed garbled content under some circumstances
  • Tags were lost on messages in shared IMAP folders under some circumstances
  • Various theme changes to achieve "pixel perfection": Unread icon, "no results" icon, paragraph format and font selector, background of folder summary tooltip
  • Calendar: Event attendee dialog was not displayed correctly
  • Various security fixes

New in Thunderbird 68.3.1 (Dec 17, 2019)

  • CHANGED:
  • In dark theme unread messages no longer shown in blue to distinguish from tagged messages
  • Account setup is now using client side DNS MX lookup instead of relying on a server.
  • FIXED:
  • Searching LDAP address book crashed in some circumstances
  • Message navigation with backward and forward buttons did not work in some circumstances
  • WebExtension toolbar icons were displayed too small
  • Calendar: Tasks due today were not listed in bold
  • Calendar: Last day of long-running events was not shown

New in Thunderbird 68.3.0 (Dec 3, 2019)

  • NEW:
  • Message display toolbar action WebExtension API
  • Navigation buttons are now available in content tabs, for example those opened via an add-on search
  • CHANGED:
  • "New email" icon in Windows systray changed from in-tray with arrow to envelope
  • FIXED:
  • Icons of attachments in the attachment pane of the Write window not always correct
  • Toolbar buttons of add-ons in the menubar not shown after startup
  • LDAP lookup not working when SSL was enabled. LDAP search not working when "All Address Books" was selected.
  • Scam link confirmation panel not working
  • In Write window, the Link Properties dialog wasn't showing named anchors in context menu
  • Calendar: Start-up failed if the application menu is not on the calendar toolbars
  • Chat: Account reordering via drag-and-drop not working on Instant messaging status dialog (Show Accounts)

New in Thunderbird 68.2.2 (Nov 7, 2019)

  • Then upgrading a 64bit version of Thunderbird version 60 to version 68, the existing profile wasn't recognized and a new profile was created.
  • Note: If your profile is still not recognized, select it by visiting about:profiles in the Troubleshooting Information.

New in Thunderbird 68.2.1 (Oct 31, 2019)

  • NEW:
  • A language for the user interface can now be chosen in the advanced settings (multilingual UI)
  • FIXED:
  • Problem with Google authentication (OAuth2)
  • Selected or unread messages not shown in the correct color in the thread pane (message list) under some circumstances
  • When using a language pack, names of standard folders weren't localized
  • Address book default startup directory in preferences panel not persisted
  • Various visual glitches: Conditions in filter editor not high enough, folder location widget not showing folder name, problem with menubar customization, add-on home page links accumulating, theme issues on Windows 7
  • Chat: Extended context menu on Instant messaging status dialog (Show Accounts)

New in Thunderbird 68.2.0 (Oct 23, 2019)

  • New features:
  • Message Display WebExtension API
  • Message Search WebExtension API
  • Bug fixes:
  • Better visual feedback for unread messages when using the dark theme
  • Various issues when editing mailing lists
  • Integration with macOS addressbook and notifications not working after introduction of notarization
  • Application windows not maintaining their size after restart
  • Issues when upgrading from a 32bit version of Thunderbird to a 64bit version. Note: If your profile is still not recognised, selected it by visiting about:profiles in the Troubleshooting Information.

New in Thunderbird 68.1.2 (Oct 11, 2019)

  • Visual glitches: Missing context menu in filter, downloads, password manager and Config Editor search boxes, unwanted scrollbars and cut-off text in Account Manager, incorrect colors in Calendar agenda scrollbars, theme issues on Windows 7
  • Some attachments couldn't be opened in messages originating from MS Outlook 2016
  • Address book import form CSV
  • Performance problem in message body search
  • Ctrl+Enter to send a message would open an attachment if the attachment pane had focus
  • Calendar: Issues with "Today Pane" start-up
  • Calendar: Glitches with custom repeat and reminder number input
  • Calendar: Problems with WCAP provider

New in Thunderbird 68.1.1 (Sep 27, 2019)

  • Issues with attachments in IMAP messages
  • Gmail accounts ignored a non-standard trash folder selection. Note: If non-standard trash folder was selected previously in the account settings, this setting will now take effect which may be unexpected.
  • Entering/pasting lists of recipients into the addressing widget or mailing list not working reliably, especially when lists contained multiple commas or semicolons
  • Edit mailing list not working
  • Various theme fixes, especially dark theme improvements for Calendar
  • Contrast between tag label and background not optimal
  • Account Central pane always loaded at start-up
  • "Config Editor" button not removed if blocked by policy
  • Calendar: Free/busy information in attendees dialog not scrolled correctly. Note: Scroll arrows still not behaving correctly.
  • Various security fixes

New in Thunderbird 68.1.0 (Sep 13, 2019)

  • NEW:
  • Offer to configure Exchange accounts for Office365. A third-party add-on is required for this account type. IMAP still exists as alternative.
  • FIXED:
  • Edit tag not working
  • Write window: "Insert > Characters and Symbols" not working
  • Moving/dragging messages from "Search Messages" result dialog not working
  • Command line -compose "attachment=" not working
  • Custom views not working
  • Issues with list of content types/actions for incoming attachments
  • "Learn More" links in Error Console not working
  • Visual glitches: Quick Filter Bar tag buttons too tall, missing scroll bar on Connection Setting subdialog, LDAP server selection after "New", "Edit" and "Delete"
  • Calendar: Parts of CalDAV dialog not working

New in Thunderbird 68.0 (Aug 28, 2019)

  • NEW:
  • File link attachments can now be linked to again instead of uploading them again
  • Mark all folders of an account as read
  • Run filters periodically. Improved filter logging.
  • OAuth2 authentication for Yandex
  • Language packs can now be selected in the Advanced Options. Preference intl.multilingual.enabled needs to be set (and possily also extensions.langpacks.signatures.required needs to be set to false)
  • On Windows a 64bit installer and MSI package are now available, see the Thunderbird for Organisations page for details
  • Added a policy engine that allows customized Thunderbird deployments in enterprise environments, using Windows Group Policy or a cross-platform JSON file
  • TCP keepalive for IMAP protocol
  • Full Unicode support for MAPI interfaces: New support for MAPISendMailW
  • To protect your profile data against a downgrade, Thunderbird 68 may display a message "You have launched an older version of Thunderbird" and will not allow opening a specific profile. Workaround: start with option --allow-downgrade. See this support article for details.
  • Calendar: Time zone data can now include past and future changes. All known time zone changes from 2018 to 2022 are included.
  • Chat: In each conversation an individual spellcheck language can be selected now
  • CHANGED:
  • Add-on support: Add-ons are only supported if add-on authors have adapted them
  • Dictionary support: Only WebExtension dictionaries are supported now. Both addons.mozilla.org and addons.thunderbird.net now provide WebExtension dictionaries.
  • Theme support: Only WebExtension themes are supported now. Both addons.mozilla.org and addons.thunderbird.net now provide WebExtension themes.
  • The stand-alone options window has been removed, all options are now shown in a tab
  • Changed UI when installing add-ons
  • Various theme improvements including a dark message list/thread pane
  • Application menu aka "Hamburger menu"
  • Improvements when entering, selecting and removing recipients in the Write window
  • FileLink: WeTransfer is already included. Dropbox and Box.com using the new WebExtensions FileLink API are available as add-ons, amongst others.
  • Text and background colors in the Write window and custom colors for tags are no longer restricted to a fixed 10x7 matrix of HTML colors
  • Composition text and background colors no longer sent by default. New option in "Tools > Options, Composition".
  • UI improvements for external and detached attachments, now showing as links with new menu option "Open Containing Folder"
  • Improved phishing attempt detection for messages with certain forms
  • Improvements to scam warnings
  • Reply to self will now search all identities (default of preference mailnews.reply_to_self_check_all_ident changed to true)
  • Maildir now uses the message ID as file name and "eml" as file extension
  • Auto-compact threshold increased from 20 MB to 200 MB
  • Calendar: UI improvements for event dialog
  • Calendar: Thunderbird's calendar add-on Lightning now uses the same version numbering scheme
  • FIXED:
  • Column choice and sort order in "Search Messages" dialog lost after relaunch
  • Global indexer causing high CPU loads under some circumstances
  • Tags set on IMAP folders sometimes not visible to other users
  • "Contribute" button in add-on details not working
  • SMTP password wasn't removed when account was deleted or server or user name were changed
  • Mbox to Maildir conversion not working if Windows search integration is enabled
  • Mails won't get removed from Trash folder using Maildir. Note: Other deletion issues related to Maildir may still persist.
  • When sending of a message failed due a security issue, only "unknown error" was displayed. Now more details are given.
  • Improvements of SMTP 5.7.1 message
  • Calendar: Multiple connections with different users to the same CalDAV server not working
  • Chat: Fixed XMPP authentication when using SASL

New in Thunderbird 60.8.0 (Jul 12, 2019)

  • Calendar: Problems when editing event times, some related to AM/PM setting in non-English locales.

New in Thunderbird 60.7.2 (Jun 21, 2019)

  • Various security fixes.

New in Thunderbird 60.7.1 (Jun 14, 2019)

  • No prompt for smartcard PIN when S/MIME signing is used
  • Various security fixes

New in Thunderbird 67.0 Beta 1 (Apr 2, 2019)

  • ADD-ON SUPPORT: Restartless add-ons continue to work if their authors have made the necessary minor adjustments. Non-restartless legacy add-ons using XUL overlays are only supported if add-on authors have adapted them. Apart from Lightning/Calendar there are a few that have been adapted, like "ThunderHTMLedit", "Compact Header", "Signature Switch" and "Send Later".
  • DICTIONARY SUPPORT: Only WebExtension dictionaries are supported now. Both addons.mozilla.org and addons.thunderbird.net now provide WebExtension dictionaries.
  • Improvements when entering, selecting and removing recipients in the Write window

New in Thunderbird 60.6.1 (Mar 25, 2019)

  • Various security fixes.

New in Thunderbird 60.6.0 (Mar 20, 2019)

  • FIXED:
  • Calendar: Can't create repeating event with end date when using certain time zones, for example Europe/Minsk

New in Thunderbird 60.5.3 (Mar 6, 2019)

  • Problem when using "Send to > Mail recipient" on Windows introduced in version 60.5.2.

New in Thunderbird 60.5.2 (Feb 26, 2019)

  • Crash when using "Send to > Mail recipient" on Windows under some circumstances (MAPI interface)
  • UTF-8 support for MAPISendMail
  • Problem with S/MIME certificate verification when receiving email from Outlook (issue introduced in version 60.5.1)

New in Thunderbird 60.5.1 (Feb 18, 2019)

  • CalDav access to some servers not working
  • Various security fixes

New in Thunderbird 60.5.0 (Jan 29, 2019)

  • FileLink provider WeTransfer to upload large attachments
  • Thunderbird now allows the addition of OpenSearch search engines from a local XML file using a minimal user inferface: [+] button to select a file an add, [-] to remove.
  • More search engines: Google and DuckDuckGo available by default in some locales
  • During account creation, Thunderbird will now detect servers using the Microsoft Exchange protocol. It will offer the installation of a 3rd party add-on (Owl) which supports that protocol.
  • Thunderbird now compatible with other WebExtension-based FileLink add-ons like the Dropbox add-on
  • Fixed crash when using custom sound for new email notification
  • Various security fixes

New in Thunderbird 60.4.0 (Dec 22, 2018)

  • WebExtensions FileLink API to facilitate FileLink add-ons for WeTransfer and Dropbox (forthcoming)
  • Decoding problems for messages with less common charsets (cp932, cp936)
  • New messages in the drafts folder (and other special or virtual folders) will no longer be included in the new messages notification

New in Thunderbird 60.3.2 (Nov 30, 2018)

  • Under some circumstances Thunderbird on Mac will send attachments using the so-called AppleDouble format which can lead to problems with mail servers and recipients
  • Encoding problems when exporting address books or messages using the system charset. Messages are now always exported using the UTF-8 encoding.
  • If the "Date" header of a message was invalid, Jan 1970 or Dec 1969 was displayed. Now using date from "Received" header instead.
  • Body search/filtering didn't reliably ignore content of tags
  • Inappropriate warning "Thunderbird prevented the site (addons.thunderbird.net) from asking you to install software on your computer" when installing add-ons
  • Incorrect display of correspondents column since own email address was not always detected
  • Spurious (encoded newline) inserted into drafts and sent email
  • New email not inserted in correct sort order in threaded unified view or search folder

New in Thunderbird 60.3.1 (Nov 22, 2018)

  • Double-clicking on a word in the Write window sometimes launched the Advanced Property Editor or Link Properties dialog
  • Cookie removal (not working since Thunderbird version 52)
  • "Download rest of message" not working if global inbox was used
  • Encoding problems for users (especially in Poland) when a file was sent via a folder using "Sent to > Mail recipient" due to a problem in the Thunderbird MAPI interface
  • According to RFC 4616 and RFC 5721, passwords containing non-ASCII characters are encoded using UTF-8 which can lead to problems with non-compliant providers, for example office365.com. The SMTP LOGIN and POP3 USER/PASS authentication methods are now using a Latin-1 encoding again to work around this issue.
  • Shutdown crash/hang after entering an empty IMAP password

New in Thunderbird 60.2.1 (Oct 3, 2018)

  • Calendar: Default values for the first day of the week and working days are now derived from the selected datetime formatting locale (restart after changing locale in the OS required)
  • Calendar: Switch to a Photon-style icon set for all platforms
  • Multiple requests for master password when Google Mail or Calendar OAuth2 is enabled
  • Scrollbar of the address entry auto-complete popup does not work
  • Security info dialog in compose window does not show certificate status
  • Links in the Add-on Manager's search results and theme browsing tabs open in external browser
  • Localized versions of Thunderbird didn't show a localized name for the "Drafts" and "Sent" folders for certain IMAP providers (particularly in France)
  • Replying to a message with an empty subject inserted Re: twice (not working in Thunderbird 60.0)
  • Spellcheck marks disappeared erroneously for words with an apostrophe (not working in Thunderbird 60.0)
  • Calendar: First day of the week cannot be set
  • Calendar: Several fixes related to cutting/deleting of events and email scheduling

New in Thunderbird 60.0 (Aug 6, 2018)

  • When writing a message, a delete button now allows the removal of a recipient. This delete button is displayed when hovering the To/Cc/Bcc selector.
  • Many improvements to attachments handling during compose: Attachments can now be reordered using a dialog, keyboard shortcuts, or drag and drop. The "Attach" button moved to the right to be above the attachment pane. The access key of the attachment pane (e.g. Alt+M, may vary depending on localization, Ctrl+M on Mac) now also works to show or hide the pane. The attachment pane can also be shown initially when composing a new message. Right-click on the header to enable this option. Hiding a non-empty attachment pane will now show a placeholder paperclip to indicate the presence of attachments and avoid sending them accidentally.
  • "Edit Template" command. This also solves various problems when saving as template (duplicates created, message ID lost).
  • "New Message from Template" command
  • Allow changing the Spellcheck Language from status bar
  • Light and Dark themes
  • WebExtension themes are now enabled in Thunderbird
  • A default startup directory in the address book window can now be configured
  • Individual feed update interval
  • An option under "Tools > Options, Advanced, General" now allows to select whether date/time display will follow the application locale (adjusted by operating system's format settings for that locale) or the locale selected in the operating system's regional settings. In other words, an US English Thunderbird can use, for example, German formats.
  • OAuth2 authentication for Yahoo and AOL
  • FIDO U2F support
  • Thunderbird now allows the conversion of folders from mbox to maildir format and vice versa. This is an experimental feature that needs to be enabled by setting the preference mail.store_conversion_enabled. Note that this functionality does not not work if the option "Allow Windows Search/Spotlight to search messages" is selected.
  • Calendar: Allow copying, cutting or deleting of a selected occurrence or the entire series for recurring events
  • Calendar: Provide an option to display locations for events in calendar day and week views
  • Calendar: Provide the ability for sending/not sending meeting notifications directly instead of showing a popup
  • Calendar: Option to select the target calendar when pasting an event or task
  • Calendar: Allow email scheduling for CalDAV servers supporting server-side scheduling
  • Thunderbird Chat now contains multiple built-in message themes
  • IMPORTANT: Add-ons not marked as compatible with Thunderbird 60 by their authors will be disabled (this can be reverted via preference extensions.strictCompatibility)
  • IMAP: When after sending a message storing that sent message fails, the message can now be stored in a local folder
  • Add-on options can no longer be configured from the Add-on Manager page. A new menu item "Add-on Options" is now available on the Tools menu.
  • When messages are composed in paragraph format, "body text" and split mail quotes are converted to paragraphs when pressing the enter key
  • "Edit As New Message" will now use the account's default compose format, either HTML or plain text ignoring the format of the message. Plain text messages will be converted to HTML and vice versa. Then using the modifier, the format choice will be reverted.
  • The "Edit Draft" command now also honors the use of the shift key to convert HTML to plain text or vice versa when editing a draft
  • The plain text to HTML conversion has been improved where such a conversion is necessary for "Edit As New Message" or when the shift modifier is used for "Edit Draft" or "New Message from Template".
  • During address entry, the matching part of the address is now shown in bold. Preference mail.autoComplete.commentColumn allows to display the address book where the address is stored.
  • When attaching a message via drag and drop, the subject of the message is now used as attachment name instead of "Attached Message"
  • Better address book photo handling: Photos can be added by drag and drop and a copy of all photos will be stored in the Thunderbird profile
  • On first start, Thunderbird now shows the account setup dialog, no longer the account provisioner dialog
  • Thunderbird follows Firefox' Photon design with rectangular tabs and many other theme improvements
  • When customizing the From: address, Thunderbird will now use this address for the SMTP "MAIL FROM" command. Previously the address configured in the identity was used. The preference mail.smtp.useSenderForSmtpMailFrom allows return to the previous behavior.
  • Native notifications on Linux are now re-enabled
  • Thunderbird now uses Mozilla's latest proxy technology (add-on FoxyProxy now supported)
  • Thunderbird now uses the latest Rust-based Mozilla technology, including Quantum's CSS engine (based on Servo) and encoding_rs, for displaying and encoding messages
  • Calendar: Removal of capability to send email invitations compatible to Outlook 2002 and earlier
  • Calendar: Reminders on read-only calendars can now be dismissed, while reminders for missed events will now only be displayed for writable calendars if option "Show missed reminders for writable calendars" is selected
  • Thunderbird Chat: Nicknames inside of messages are colored to match the participants list
  • When many Thunderbird clients or other email clients accessed the same IMAP draft folder, messages were sometimes sent with the wrong identity. This has been corrected and the user will be notified if none of their identities matches the draft.
  • Various problems related to handling the IMAP trash folder: Under certain circumstances the selection of the trash folder didn't persist, for example when the name contained non-ASCII characters, or in localized versions of Thunderbird. At times unwanted additional trash folders were created. Selection of a trash folder didn't give immediate visual feedback.
  • Shared IMAP folders not shown in subscribe dialog under some circumstances
  • Messages moved between IMAP accounts were missing parts (embedded content or attachments) under some circumstances
  • Improvements encoding/decoding message headers
  • Text in the address book card view wasn't selectable
  • Passwords can now contain non-ASCII characters, like international characters, for example áäß, and symbols, for example €§
  • Outlook import. Note: Mail, address book and settings need to be imported individually as "Import Everything" currently does not work.
  • Localised versions of Thunderbird didn't show a localised name for Hotmail's "Deleted" folder
  • Contacts sidebar: Selection and context menu behavior
  • Better error handling for Gmail authentication to avoid re-downloading of folders
  • Thunderbird used a stale cached password after user edited a saved password
  • Calendar: Wrong time formatting for some time zones
  • Calendar: Can't copy information from event dialog for received invitations

New in Thunderbird 52.9.0 (Jul 5, 2018)

  • Thunderbird will now prompt to compact IMAP folders even if the account is online
  • Complete fix of the EFAIL vulnerability: 1) Removing some HTML crafted to carry out an attack. 2) Optionally: Not decrypting subordinate message parts that otherwise might reveal decryted content to the attacker. Preference mailnews.p7m_subparts_external needs to be set to true for added security.
  • Various problems when forwarding messages inline when using "simple" HTML view
  • Various security fixes

New in Thunderbird 52.8.0 (May 21, 2018)

  • Various security fixes.

New in Thunderbird 52.7.0 (Apr 1, 2018)

  • Searching message bodies of messages in local folders, including filter and quick filter operations, did not find content in message attachments
  • Better error handling for Yahoo accounts
  • Various security fixes

New in Thunderbird 52.5.2 (Dec 27, 2017)

  • This releases fixes the "Mailsploit" vulnerability and other vulnerabilities detected by the "Cure53" audit.

New in Thunderbird 52.5.0 (Nov 25, 2017)

  • Better support for Charter/Spectrum IMAP: Thunderbird will now detect Charter's IMAP service and send an additional IMAP select command to the server. Check the various preferences ending in "force_select" to see whether auto-detection has discovered this case.
  • In search folders spanning multiple base folders clicking on a message sometimes marked another message as read
  • IMAP alerts have been corrected and now show the correct server name in case of connection problems
  • POP alerts have been corrected and now indicate connection problems in case the configured POP server cannot be found
  • Various security fixes

New in Thunderbird 52.4.0 (Oct 25, 2017)

  • NEW:
  • In Thunderbird 52 a new behavior was introduced for replies to mailing list posts: "When replying to a mailing list, reply will be sent to address in From header ignoring Reply-to header". A new preference mail.override_list_reply_to allows to restore the previous behavior.
  • FIXED:
  • Under certain circumstances (image attachment and non-image attachment), attached images were shown truncated in messages stored in IMAP folders not synchronised for offline use.
  • IMAP UIDs > 0x7FFFFFFF not handled properly
  • Various security fixes

New in Thunderbird 52.3.0 (Sep 4, 2017)

  • Various security fixes
  • Large attachments taking a long time to open under some circumstances
  • No authorisation prompt displayed when inserting image into email body although image URL requires authentication
  • Selected text from another message sometimes included in a reply
  • Inline images not scaled to fit when printing
  • Message disposition flag (replied / forwarded) lost when reply or forwarded message was stored as draft and draft was sent later
  • Deleting message from the POP3 server not working when maildir storage was used
  • Unwanted inline images shown in rogue SPAM messages

New in Thunderbird 52.2.1 (Jun 24, 2017)

  • Problems with Gmail (folders not showing, repeated email download, etc.) introduced in version 52.2.0.

New in Thunderbird 52.2.0 (Jun 14, 2017)

  • Embedded images not shown in email received from Hotmail/Outlook webmailer
  • Detection of non-ASCII font names in font selector
  • Attachment not forwarded correctly under certain circumstances
  • Multiple requests for master password when GMail OAuth2 is enabled
  • Large number of blank pages being printed under certain circumstances when invalid preferences were present
  • Messages sent via the Simple MAPI interface are forced to HTML
  • Calendar: Invitations can't be printed
  • Mailing list (group) not accessible from macOS or Outlook address book
  • Clicking on links with references/anchors where target doesn't exist in the message not opening in external browser
  • Various security fixes

New in Thunderbird 52.1.1 (May 15, 2017)

  • Crash when compacting IMAP folder
  • Some attachments can't be opened or saved if the message body is empty
  • Unable to load full message via POP if message was downloaded partially (or only headers) before
  • Large attachments may not be shown or saved correctly if the message is stored in an IMAP folder which is not synchronized for offline use

New in Thunderbird 52.1.0 (Apr 30, 2017)

  • Fixed:
  • Background images not working and other issues related to embedded images when composing email
  • Google Oauth setup can sometimes not progress to the next step

New in Thunderbird 52.0.1 (Apr 17, 2017)

  • Clicking on a link in an email may not open this link in the external browser.
  • Crash due to incompatibility with McAfee Anti-SPAM add-on. Add-on is blocked in 52.0.1

New in Thunderbird 52.0 (Apr 5, 2017)

  • New:
  • Folder pane toolbar and folder view selector (replacement for folder view arrows)
  • Optionally remove corresponding data files when removing an account from Thunderbird
  • Import settings from Becky! Internet Mail
  • Possibility to copy message filter
  • Dictionary setting is restored when editing a draft. Content-Language header (RFC 3282) transmitted with message
  • Calendar: Event can now be created and edited in a tab
  • Calendar: Processing of received invitation counter proposals
  • Chat: Support Twitter Direct Messages
  • Chat: Liking and favoriting in Twitter
  • Chat: XMPP: Support SASL SCRAM authentication mechanism
  • Chat: Support Jabber/XMPP Message Carbons (XEP-280)
  • Changed:
  • IMPORTANT: The way images are included in a compose window has changed. Images are now included as data URIs and not as references to parts of other messages or operating system files. This allows better interoperability with office packages such as MS Office or LibreOffice. Images linked from locations on the internet will no longer be downloaded and attached to the message automatically. This can be changed for each image individually via the Image Properties dialog or globally by setting the preference mail.compose.attach_http_images.
  • Correspondents column now default for all new folders, can be switched off with preference mail.threadpane.use_correspondents
  • When replying to a mailing list, reply will be sent to address in From header ignoring Reply-to header
  • On Linux PulseAudio is now required to play sound
  • Formatting toolbar is now left in place when delivery format is switched to plain text only
  • Messages in IMAP folders read on external device are now filtered by default
  • Folders backed by mbox storage larger than 4GB are supported without warning (unless preference mailnews.allowMboxOver4GB is set to false)
  • IMAP caching now uses Mozilla's latest caching technology
  • Chat: Removed Yahoo! Messenger support (since Yahoo removed support)
  • Fixed:
  • Message preview pane non-functional after IMAP folder was renamed or moved
  • Editing in paragraph format: Pressing Shift+Enter sometimes doesn't move the cursor to the next line
  • Various corrections when composing messages in paragraph format
  • Paste as quotation doesn't always work
  • Long lines in plain text replies not properly wrapped
  • Undesired white-space before signature in paragraph mode
  • When attachment unavailable, compose shows endless "Attaching..." message instead of error
  • Text encoding of reply sometimes incorrect (uses encoding of last viewed message)
  • Text encoding of message display, reply or forwarded message sometimes incorrect (uses encoding of attachment)
  • Delivery Format not preserved for saved drafts (Auto-Detect|Plaintext|HTML|Both)
  • Reply to own e-mail does not reply with the correct identity
  • IMAP message part caching
  • Links with escaped non-ASCII (international) characters can't be clicked
  • Calendar: Events specified in timezone "local time" generate alerts in UTC time
  • Chat: XMPP Resource collisions

New in Thunderbird 45.7.1 (Feb 8, 2017)

  • Crash when viewing certain IMAP messages (introduced in 45.7.0)

New in Thunderbird 45.7.0 (Jan 27, 2017)

  • Message preview pane non-functional after IMAP folder was renamed or moved
  • "Move To" button on "Search Messages" panel not working
  • Message sent to "undisclosed recipients" shows no recipient (non-functional since Thunderbird version 38)
  • Calendar: No way to accept/decline email invitations when sent and received messages are stored in the same folder
  • Various security fixes

New in Thunderbird 45.5.1 (Dec 1, 2016)

  • Various security fixes.

New in Thunderbird 45.5.0 (Nov 18, 2016)

  • Support changes to character limit in Twitter.
  • Reply with selected text containing quote resulted in wrong quoting level indication.
  • Email invitation might not be displayed when description contains non ascii characters.
  • With address auto-complete, cursor-key selected popup value was not confirmed with enter or tab (and related issues)
  • Mail address display at header pane was garbled for certain RSS feeds
  • Attempting to sort messages on the Date field whilst a quick filter is applied got stuck on sort descending

New in Thunderbird 45.2.0 (Jul 2, 2016)

  • Invitations to events could not be printed.
  • Dragging and dropping of contacts from the contact list onto an addressbook while All Addressbooks is selected moved only one contact
  • Falsely reported not enough disk space during compacting
  • Links were not always detected properly in the message body (terminated early on "|", some long links not detected at all)

New in Thunderbird 45.2 Beta 1 (Jun 3, 2016)

  • When entering members into a mailing list, the enter key dismissed the panel instead of just moving onto the next line
  • Email without HTML elements was sent as HTML, despite "Delivery Format: Auto-detect" option
  • Options applied to a template were lost when the template was used.
  • Contacts could not be deleted when they were found through a search
  • Views from global searches did not respect "mail.threadpane.use_correspondents"

New in Thunderbird 45.1.1 (May 30, 2016)

  • When entering members into a mailing list, the enter key dismissed the panel instead of just moving onto the next line
  • Email without HTML elements was sent as HTML, despite "Delivery Format: Auto-detect" option
  • Options applied to a template were lost when the template was used.
  • Contacts could not be deleted when they were found through a search
  • Views from global searches did not respect "mail.threadpane.use_correspondents"

New in Thunderbird 45.1.0 (May 11, 2016)

  • Drag & Drop a contact name from Thunderbird address book (list view) to address box in a new message “compose” window failed.
  • UI elements became larger when moused over on retina displays/monitor on Mac OS X
  • DIGEST-MD5 authentication in JS-XMPP failed for some users (now disabled).
  • Font indicator in compose falsely claimed certain fonts were not installed.
  • Printing failed in composition window.
  • Various improvements in handling of message compose in paragraph mode.
  • Automatic correspondents column upgrade disabled

New in Thunderbird 45.0 (Apr 13, 2016)

  • Add a Correspondents column combining Sender and Recipient
  • Much better support for XMPP chatrooms and commands.
  • Remote content exceptions: Improved options to add exceptions.
  • Implement option to always use HTML formatting to prevent unexpected format loss when converting messages to plain text.
  • Use OpenStreetmap for maps (even allow the user to choose from list of map services)
  • Allow spell checking and dictionary selection in the subject line
  • Allow editing of From when composing a message.
  • Add dropdown in compose to allow specific setting of font size.
  • Return/Enter in composer will now insert a new paragraph by default (shift-Enter will insert a line break)
  • Allow copying of name and email address from the message header of an email
  • Mail.ru supports OAuth authentication.
  • Fixed: When sending e-mail which was composed using Chinese, Japanese or Korean characters, unwanted extra spaces were inserted within the text.
  • Spell checker checked spelling in invisible HTML parts of the message.
  • When saving a draft that is edited as new message, original draft was overwritten.
  • External images not displayed in reply/forward
  • Crashed in some cases while parsing IMAP messages.
  • Properly preserve pre-formatted blocks in message replies.
  • Copy/paste from a plain text editor lost white-space (multiple spaces/blanks, tabs, newlines)
  • "Open Draft"/"Forward"/"Edit As New"/"Reply" created message composition with incorrect character encoding.
  • Fixed: Grouped By view sort direction change was broken, plus enabled custom column grouping.
  • Fixed: New emails into a mailbox did not adhere to sort order by received.
  • Fixed: Box.com attachments failed to upload.
  • Fixed: Drag and drop of multiple attachments failed to OS file folder.
  • XMPP had connection problems for users with large rosters

New in Thunderbird 38.7.1 (Mar 24, 2016)

  • Font vulnerabilities in the Graphite 2 library
  • Buffer overflow during ASN.1 decoding in NSS
  • Out-of-bounds read in HTML parser following a failed allocation
  • Memory corruption with malicious NPAPI plugin
  • Use-after-free during XML transformations
  • Use-after-free in SetBody
  • Use-after-free in HTML5 string parser
  • Memory leak in libstagefright when deleting an array during MP4 processing
  • Local file overwriting and potential privilege escalation through CSP reports
  • Miscellaneous memory safety hazards (rv:45.0 / rv:38.7)

New in Thunderbird 38.6.0 (Feb 12, 2016)

  • Various security fixes.
  • Filters ran on a different folder than selected
  • For Windows systems on roaming profiles, could not display messages after Thunderbird update (related to Lightning updates)

New in Thunderbird 38.5.1 (Jan 7, 2016)

  • Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements.

New in Thunderbird 38.4.0 (Nov 26, 2015)

  • Various security fixes
  • Fixed issue where messages moves of multiple messages from a maildir folder to an mbox folder failed.

New in Thunderbird 38.3.0 (Oct 1, 2015)

  • Saved files tab now implements Search field and Clear button.
  • (Right-)Clicking on a newsgroup now allows directly composing a message again
  • Importing to the address book from CSV now works with international characters
  • Thunderbird no longer crashes when executing filter rules when using maildir
  • When using the maildir storage format, the INBOX folder is no longer deleted
  • Emails with long References headers are now decoded correctly
  • Checking for new messages correctly works after hibernation again
  • Chat entries are no longer sometimes lost in global database at shutdown.

New in Thunderbird 38.2.0 (Aug 16, 2015)

  • Changed:
  • Hardware acceleration is now disabled by default to avoid crashing Thunderbird
  • Fixed:
  • A few bugs have been fixed to avoid crashing Thunderbird

New in Thunderbird 38.1.0 (Jul 13, 2015)

  • Copy/Paste into plain text editor deletes newlines from quoted text (bug 1143570)
  • Cross-posts won't send because Newsgroups: groups are separated with comma+space, not just comma (bug 1151448)
  • Cannot send email through exchange server (NTLM) (bug 1174159)
  • Doesn't display GB2312 encoded texts correctly for Chinese Characters (bug 1174580)
  • OAuth2 authentication for GMail does not work when specified server is imap.gmail.com or smtp.gmail.com. (bug 1176773)

New in Thunderbird 38.0.1 (Jun 10, 2015)

  • GMail supports OAuth2 authentication, removing the need to manually select "allow less secure applications" in Google options for the account. (bug 849540)
  • Ship Lightning calendar addon with Thunderbird and enable with an opt-out dialog (bug 1113183)
  • Filter sent messages (bug 11039)
  • Filter messages when archived (bug 479823)
  • Enable search in multiple/all address books (bug 170270)
  • Add support for Yahoo Messenger in Chat (bug 955574)
  • Support Internationalized domain name URLs for RSS feeds (Bug 1018589)
  • Show expanded columns in folder pane (bug 464973)
  • Allow file-per-message (maildir) local message storage (bug 845952)
  • Add a Learn more link to the support page in feeds subscribe dialog (bug 1053782)
  • Add reading position marker line to conversations (bug 760762)
  • The editor for twitter should show inputtable character count (bug 736002)
  • Thunderbird will no longer use SHA-1 to sign messages (bug 1018259)
  • Removed rarely used character sets: T.61-8bit, non-encoding Mac encoders, VISCII, x-viet-tcvn5712, x-viet-vps x-johab, ARMSCII8 , map us-ascii to windows-1252, ISO-8859-6-I and -E and ISO-8859-8-E, (bug 1068505 and others.)
  • Disable CONDSTORE support for IMAP to prevent discrepancies in IMAP message status (deleted, unread) on some servers (bug 912216)
  • Make OpenSearch queries open in the user's default browser (bug 1120777)
  • Default to using SSL for XMPP and IRC. This might cause issues for self-signed certificates (bug 1122567, bug 1122666)
  • Replied/forwarded icons disappear after folder repair, detach/delete (bug 840418)
  • Attachment "Save As" files are displayed in Tools/Saved Files (bug 914517)
  • Adding unknown email addresses to Mailing list, then deleting ghost duplicate entries from contacts pane, caused dataloss in mailing list (bug 628035)
  • Web site from RSS feed was not rendered correctly (bug 662907)
  • Email address with leading/trailing whitespace displayed wrongly with added quotes when composing ["foo"@bar.com] (bug 286760)
  • Force display of Sender header if S/MIME sender is the signer (bug 332639)
  • Addressing autocomplete widget: Typed text in red despite results/matches found if suggestions change by last input (bug 1042561)
  • Status bar not accessible (bug 934875)
  • Wrong folder may be deleted when requesting junk delete (bug 1018960)
  • Severe UI stutter or freezes getting new mail for very large folders (bug 870556)
  • Automatically rejoin multi-user conversations on reconnect for XMPP (bug 1014472)
  • Various improvements when using IRC on moznet (bug 1083768 and others)
  • Significantly improve XMPP support (bug 1085022 and others)
  • Fixes for connecting to non-standard IRC networks (bug 870556 and others)
  • Automatically reclaim IRC nicks during a reconnect (bug 1087566)
  • Changing location in editor doesn't preserve the font when returning to end of text/line (bug 756984)
  • Inline spell checker loses red underlines after a backspace is used (bug 1100966)

New in Thunderbird 38.0 Beta 6 (May 24, 2015)

  • Filter sent messages (bug 11039)
  • Support Internationalized domain name URLs for RSS feeds (Bug 1018589)
  • Filter messages when archived (bug 479823)
  • Enable search in multiple/all address books (bug 170270)
  • Show expanded columns in folder pane (bug 464973)
  • Allow file-per-message (maildir) local message storage (bug 845952)
  • Add a Learn more link to the support page in feeds subscribe dialog (bug 1053782)
  • Support Yahoo! Messenger chat protocol (bug 955574)
  • OAuth2 can be selected for gmail accounts in advanced and manual account configuration (bug 849540)
  • Add reading position marker line to conversations (bug 760762)
  • The editor for twitter should show inputtable character count (bug 736002)
  • Thunderbird will no longer use SHA-1 to sign messages (bug 1018259)
  • Removed rarely used character sets: T.61-8bit, non-encoding Mac encoders, VISCII, x-viet-tcvn5712, x-viet-vps x-johab, ARMSCII8 , map us-ascii to windows-1252, ISO-8859-6-I and -E and ISO-8859-8-E, (bug 1068505 and others.)
  • Disable CONDSTORE support for IMAP to prevent discrepancies in IMAP message status (deleted, unread) on some servers (bug 912216)
  • Make OpenSearch queries open in the user's default browser (bug 1120777)
  • Default to using SSL for XMPP and IRC. This might cause issues for self-signed certificates (bug 1122567, bug 1122666)
  • Replied/forwarded icons disappear after folder repair, detach/delete (bug 840418)
  • Attachment "Save As" files are displayed in Tools/Saved Files (bug 914517)
  • Adding unknown email addresses to Mailing list, then deleting ghost duplicate entries from contacts pane, caused dataloss in mailing list (bug 628035)
  • Web site from RSS feed was not rendered correctly (bug 662907)
  • Email address with leading/trailing whitespace displayed wrongly with added quotes when composing ["foo"@bar.com] (bug 286760)
  • Force display of Sender header if S/MIME sender is the signer (bug 332639)
  • Addressing autocomplete widget: Typed text in red despite results/matches found if suggestions change by last input (bug 1042561)
  • Status bar not accessible (bug 934875)
  • Wrong folder may be deleted when requesting junk delete (bug 1018960)
  • Severe UI stutter or freezes getting new mail for very large folders (bug 870556)
  • Automatically rejoin multi-user conversations on reconnect for XMPP (bug 1014472)
  • Various improvements when using IRC on moznet (bug 1083768 and others)
  • Significantly improve XMPP support (bug 1085022 and others)
  • Fixes for connecting to non-standard IRC networks (bug 870556 and others)
  • Automatically reclaim IRC nicks during a reconnect (bug 1087566)

New in Thunderbird 38.0 Beta 5 (May 14, 2015)

  • Filter sent messages (bug 11039)
  • Support Internationalized domain name URLs for RSS feeds (Bug 1018589)
  • Filter messages when archived (bug 479823)
  • Enable search in multiple/all address books (bug 170270)
  • Show expanded columns in folder pane (bug 464973)
  • Allow file-per-message (maildir) local message storage (bug 845952)
  • Add a Learn more link to the support page in feeds subscribe dialog (bug 1053782)
  • Support Yahoo! Messenger chat protocol (bug 955574)
  • OAuth2 can be selected for gmail accounts in advanced and manual account configuration (bug 849540)
  • Add reading position marker line to conversations (bug 760762)
  • The editor for twitter should show inputtable character count (bug 736002)
  • Thunderbird will no longer use SHA-1 to sign messages (bug 1018259)
  • Removed rarely used character sets: T.61-8bit, non-encoding Mac encoders, VISCII, x-viet-tcvn5712, x-viet-vps x-johab, ARMSCII8 , map us-ascii to windows-1252, ISO-8859-6-I and -E and ISO-8859-8-E, (bug 1068505 and others.)
  • Disable CONDSTORE support for IMAP to prevent discrepancies in IMAP message status (deleted, unread) on some servers (bug 912216)
  • Make OpenSearch queries open in the user's default browser (bug 1120777)
  • Default to using SSL for XMPP and IRC. This might cause issues for self-signed certificates (bug 1122567, bug 1122666)
  • Replied/forwarded icons disappear after folder repair, detach/delete (bug 840418)
  • Attachment "Save As" files are displayed in Tools/Saved Files (bug 914517)
  • Adding unknown email addresses to Mailing list, then deleting ghost duplicate entries from contacts pane, caused dataloss in mailing list (bug 628035)
  • Web site from RSS feed was not rendered correctly (bug 662907)
  • Email address with leading/trailing whitespace displayed wrongly with added quotes when composing ["foo"@bar.com] (bug 286760)
  • Force display of Sender header if S/MIME sender is the signer (bug 332639)
  • Addressing autocomplete widget: Typed text in red despite results/matches found if suggestions change by last input (bug 1042561)
  • Status bar not accessible (bug 934875)
  • Wrong folder may be deleted when requesting junk delete (bug 1018960)
  • Severe UI stutter or freezes getting new mail for very large folders (bug 870556)
  • Automatically rejoin multi-user conversations on reconnect for XMPP (bug 1014472)
  • Various improvements when using IRC on moznet (bug 1083768 and others)
  • Significantly improve XMPP support (bug 1085022 and others)
  • Fixes for connecting to non-standard IRC networks (bug 870556 and others)
  • Automatically reclaim IRC nicks during a reconnect (bug 1087566)

New in Thunderbird 38.0 Beta 4 (May 5, 2015)

  • Filter sent messages (bug 11039)
  • Support Internationalized domain name URLs for RSS feeds (Bug 1018589)
  • Filter messages when archived (bug 479823)
  • Enable search in multiple/all address books (bug 170270)
  • Show expanded columns in folder pane (bug 464973)
  • Add a Learn more link to the support page in feeds subscribe dialog (bug 1053782)
  • Allow file-per-message (maildir) local message storage (bug 845952)
  • Support Yahoo! Messenger chat protocol (bug 955574)
  • OAuth2 can be selected for gmail accounts in advanced and manual account configuration (bug 849540)
  • Add reading position marker line to conversations (bug 760762)
  • The editor for twitter should show inputtable character count (bug 736002)
  • Thunderbird will no longer use SHA-1 to sign messages (bug 1018259)
  • Make OpenSearch queries open in the user's default browser (bug 1120777)
  • Removed rarely used character sets: T.61-8bit, non-encoding Mac encoders, VISCII, x-viet-tcvn5712, x-viet-vps x-johab, ARMSCII8 , map us-ascii to windows-1252, ISO-8859-6-I and -E and ISO-8859-8-E, (bug 1068505 and others.)
  • Disable CONDSTORE support for IMAP to prevent discrepancies in IMAP message status (deleted, unread) on some servers (bug 912216)
  • Default to using SSL for XMPP and IRC. This might cause issues for self-signed certificates (bug 1122567, bug 1122666)
  • Replied/forwarded icons disappear after folder repair, detach/delete (bug 840418)
  • Attachment "Save As" files are displayed in Tools/Saved Files (bug 914517)
  • Adding unknown email addresses to Mailing list, then deleting ghost duplicate entries from contacts pane, caused dataloss in mailing list (bug 628035)
  • Web site from RSS feed was not rendered correctly (bug 662907)
  • Email address with leading/trailing whitespace displayed wrongly with added quotes when composing ["foo"@bar.com] (bug 286760)
  • Force display of Sender header if S/MIME sender is the signer (bug 332639)
  • Status bar not accessible (bug 934875)
  • Wrong folder may be deleted when requesting junk delete (bug 1018960)
  • Severe UI stutter or freezes getting new mail for very large folders (bug 870556)
  • Various improvements when using IRC on moznet (bug 1083768 and others)
  • Fixes for connecting to non-standard IRC networks (bug 870556 and others)
  • Automatically reclaim IRC nicks during a reconnect (bug 1087566)
  • Addressing autocomplete widget: Typed text in red despite results/matches found if suggestions change by last input (bug 1042561)
  • Significantly improve XMPP support (bug 1085022 and others)
  • Automatically rejoin multi-user conversations on reconnect for XMPP (bug 1014472)

New in Thunderbird 31.6.0 (Apr 1, 2015)

  • Same-origin bypass through anchor navigation
  • CORS requests should not follow 30x redirections after preflight
  • resource:// documents can load privileged pages
  • Use-after-free when using the Fluendo MP3 GStreamer plugin
  • Miscellaneous memory safety hazards (rv:37.0 / rv:31.6)

New in Thunderbird 31.4.0 (Jan 14, 2015)

  • The previous issues with jp mac builds have now been fixed, and Thunderbird will no longer need to be run in 32-bit mode.
  • Installing extensions within Thunderbird no longer requires download and installing as a file.Security fixes.

New in Thunderbird 31.3.0 (Dec 2, 2014)

  • Fixes an issue where using LDAP autocomplete could end up with blank entries in the compose addressing list (Bug 1045753)
  • Fixes an issue where IRC participants were not removed from the display on leaving a channel.
  • Fixes a regression where Thunderbird wasn't respecting the skip integration option on the default client dialog.
  • Security fixes

New in Thunderbird 31.2.0 (Oct 14, 2014)

  • Fixed a case where having a contact and card in an address book with the same name could send to the mailing list (Bug 1008718)
  • Security fixes

New in Thunderbird 33.0 Beta 1 (Oct 3, 2014)

  • Add UI for disabling and clearing Visited Link/Browsing History (Bug 1020339)
  • Support Internationalized domain name URLs for RSS feeds (Bug 1018589)
  • Various fixes and performance improvements

New in Thunderbird 31.1.2 (Sep 25, 2014)

  • Fixed an issue where anchor links would not work in HTML emails (Bug 974857)
  • Security fixes

New in Thunderbird 31.1.1 (Sep 11, 2014)

  • Fixed an issue where mailing lists with spaces in their names couldn't be autocompleted (Bug 1060901)
  • Fixed an occasional startup crash (Bug 1005336)

New in Thunderbird 31.0 (Jul 21, 2014)

  • 957184 Replace |.getService() .QueryInterface(iid)| by |.getService(iid)| in comm-central
  • 991491 Fix the CSS variables after bug 985838
  • 973316 TEST-UNEXPECTED-FAIL + PROCESS-CRASH | xpcshell/tests/mailnews/local/test/unit/test_nsIMsgParseMailM…
  • 1003525 Opening a message, feed, or newsgroup message in a tab results in an empty transparent tab
  • 997638 JavaScript strict warning: chrome://messenger/content/virtualFolderProperties.js, line 71: assignmen…
  • 1005577 Can't see text beside the icons of the quickfilter bar when using a dark theme.
  • 1000203 Incorrect value checked for domains length in readFromXML
  • 853516 Blue starburst icon doesn't fit properly in TB 24 on a @2x display.
  • 953102 external api build bustage: ../../../mail/components/build/libmailcomps.a: No such file or directory
  • 686851 Implement "Open containing folder" contextual action for messages in search results, own tab, or sta…
  • 975381 Use DOM_VK_RETURN/NS_VK_RETURN instead of DOM_VK_ENTER/NS_VK_ENTER
  • 991449 TBPL Windows builds fail due to excessively long path names
  • 980356 Make nsMessengerWinIntegration.cpp compile with frozen linkage.
  • 1010714 From field doesnt have the same padding as to/cc/bcc/subject
  • 499995 fix signed/unsigned compiler warnings in mailnews
  • 765471 Mail Compact exhausts disk space, and stays full until response to ""unable to compact mail folders"…
  • 968993 selecting spans of different color in HTML message compose produces CSS warning
  • 993371 Instantly get and use favicon for feed after importing feeds from opml file or adding single feed ma…
  • 749097 Address Book quick search for strings with round brackets fails: (searchword)
  • 898860 expandeddateLabel misspelled "date" value
  • 983086 mailnews/resources/logHelper.js | Error console says [stackFrame mutating the [[Prototype]] of an ob…
  • 986927 test-attachment-menus.js fails if message reader size changes
  • 1001008 Reduce padding on compose findbar on OS X.
  • 998963 Fix to handle slow responding feed favicons
  • 581940 Drag and Drop of message to OS folder (e.g. Desktop) truncates filename prematurely and omits the .e…
  • 1002550 Win8: style AppMenu
  • 457296 Implement separate whitelist for addresses/domains allowed to load remote images for email
  • 991626 Thunderbird crash in NS_CycleCollectorSuspect3
  • 525124 Double Clicking in a Blank Space Opens the Advanced Property Editor
  • 608844 Never show remote content from site
  • 959309 Finish JSMime 0.2 and land it on comm-central
  • 768516 Thunderbird tabs in the title bar on OS X
  • 1004685 rename all occurences of "check" attribute in mailWindowOverlay.xul to "checked"
  • 992080 Use @import for shared files instead of %include
  • 953426 expose remote content per-host privileges
  • 558931 Composition's recipient autocomplete does not / fails to show all matching address book entries (imp…
  • 745301 Show favicon next to RSS/Atom feeds
  • 742746 Directed messages should be able to hook into system prompts/give notifications (similar style to ne…
  • 984155 Build Thunderbird with frozen linkage / external API - Windows fixes
  • 441437 Provide a non-rdf way to go from a URI to a msgFolder
  • 991070 followup fix for Bug 955869
  • 937056 Move UTF-7 decoder/encoder to comm-central
  • 995681 Hovering over a separated toolbar button hides the separator even in its disabled state.
  • 894306 Filelink: YouSendIt is now Hightail
  • 986724 security > passwords: strings for error message if FIPS active not defined, error popup not shown wh…
  • 946279 Implement autotagging of feed tags
  • 1001064 Update .statusMessageToolbarItem to match the new button style.
  • 993646 possibly unnecessary preprocessed css files after bug 992080
  • 586131 Quickfilter bar has lost OR functionality using | (Pipe character)
  • 953204 Use the Fx Australis titlebar styling
  • 1005687 Scam/Phishing alert no longer showing when links in identified scam messages are clicked/followed
  • 992889 Shared mailWindow1.css not imported
  • 986234 Thunderbird trunk build currently fails with "ERROR PROCESSING MOZBUILD FILE[...] ldap/moz.build T…
  • 992127 Add a LaTeX-to-MathML dialog box to the mail composer
  • 961666 Chat notification sound should be customizable
  • 992643 Options... and some others should not end w/ ellipsis.
  • 927876 Focus on filter editor does not move to new filter field
  • 1001866 Use the new Australis toolbar button style for messengercompose.css on OS X.
  • 1001869 Use the new Australis toolbar button style for the AB on OS X.
  • 414865 Attachment will lose file extension when renamed in "Save as" dialogue and "hide extension for known…
  • 984978 Adjust TB's theme for Windows 8 and up
  • 983443 cleanup some unused includes in .idl files of comm-central
  • 1000855 Icon for closing chat used in hover/onmouseover strechted, should always be square and never become …
  • 1001113 TB Perma-fail: test_bug718500.js | test failed (with xpcshell return code: 0) | Unknown chardet: UTF…
  • 981405 "Recent Folders" sorting has switched from case insensitive to case sensitive
  • 1001886 Participant tooltip content doesn't wordwrap
  • 1011616 Join Chat dialog box won't close with Auto-join this Chat Room checked
  • 992675 Tab is missing end stroke
  • 995747 Port Bug 946987: [Australis] curved tabs looks ugly when scaled up (hi-dpi)
  • 975816 Shift+Click to switch between HTML and Plain text doesn't work on Account Central "Write a new messa…
  • 865972 Incorrect use of error code generation macro.
  • 905910 Enable comm-central tests to run in parallel
  • 950455 Make thread-pane "snap to last page" behavior optional
  • 1003295 Win8: Text color on inactive tabs makes text very hard to read (FX bug 940393)
  • 978592 "Favorite Folders" view shouldn't sort in a hierarchy?
  • 530629 Ctrl+F when composing should just show find bar as usual (with "Find and Replace..." button)
  • 360648 [Meta] TB toolkit autocomplete migration
  • 999881 Use CharsetMenu instead of the old charsetOverlay in Thunderbird
  • 842963 Crash loop/repeats in libxul.so nsMsgGroupThread::RemoveChildAt
  • 995797 Possible improvement in the text of the headers of reply in the emails
  • 883670 Account wizard does not allow manual config of SMTP username
  • 964824 Add sanity-checking to message list padding improvements
  • 86233 [RFE] Show account name in status bar when downloading messages from POP servers (Getting mail from …
  • 802266 Review NS_* definitions in nsComposeStrings.h
  • 549712 Customize option in Search Messages is wonky
  • 334053 In prefs about reply headers, some sequences beginning with % give anomalous results
  • 959209 Investigate whether Thunderbird still needs the XPFE autocomplete widget
  • 951019 Port bug 915735 to mail/installer/package-manifest.in and suite/installer/package-manifest.in
  • 670445 When creating a virtual folder, the selected folder for search is incorrect. (it may miss the top-m…
  • 1003856 Selecting address from recipient autocomplete broken for all scenarios except {Name beginsWith} topm…
  • 991220 Remove Ubuntu One Support From Thunderbird
  • 985595 Toolbarbutton-icon is to small
  • 1000190 Permanent orange: test_dod.js,test_partsOnDemand.js | application crashed [@ nsStringBundleService::…
  • 989653 send filelink attachment always triggers the attachment reminder

New in Thunderbird 29.0 Beta 1 (Apr 25, 2014)

  • Bug 976536 - Fix JSFunction::existingScript returning NULL in some cases.
  • Bug 995995 - Set testing prefs to redirect to the test proxy server for RSS feeds.
  • Bug 996031 - Remove 455407.html crashtest.
  • Bug 996019 - Fix browser_bug435325.js to not connect to example.com.
  • Bug 996009 - Ensure that the richtext2 browserscope tests do not attempt to contact the external network.
  • Bug 997402 - both bing and yahoo params are broken.

New in Thunderbird 24.2.0 (Dec 11, 2013)

  • Fixed:
  • Fixed an issue where long messages with multiple signatures could end up unreadable (bug 929006)
  • Fixed an issue where editing account settings was not possible in some non-standard configurations of local folder set-ups (bug 921371)
  • Security fixes:
  • MFSA 2013-117 Mis-issued ANSSI/DCSSI certificate
  • MFSA 2013-116 JPEG information leak
  • MFSA 2013-115 GetElementIC typed array stubs can be generated outside observed typesets
  • MFSA 2013-114 Use-after-free in synthetic mouse movement
  • MFSA 2013-113 Trust settings for built-in roots ignored during EV certificate validation
  • MFSA 2013-111 Segmentation violation when replacing ordered list elements
  • MFSA 2013-109 Use-after-free during Table Editing
  • MFSA 2013-108 Use-after-free in event listeners
  • MFSA 2013-104 Miscellaneous memory safety hazards (rv:26.0 / rv:24.2)

New in Thunderbird 24.1.0 (Oct 30, 2013)

  • Fixed an issue where signatures were shown in too lighter grey making them difficult to read (bug 917906)
  • Fixed an issue where Auto CC for reply might not work if the cc address is the same as the sending address (bug 917231)
  • Security fixes

New in Thunderbird 24.0.1 (Oct 11, 2013)

  • 913785 Allow fully qualified domain names (fqdn) to be accepted as smtp/pop3/imap/news server name in the account manager
  • 919797 Help contrast by making new messages appear 'blue' instead of the link text color
  • 917955 Fix crash during newsgroup subscribe and correct sorting order of the filtered list
  • 891904 Fix inline spell checking in the compose window

New in Thunderbird 24.0 (Sep 17, 2013)

  • Various fixes and performance improvements.

New in Thunderbird 17.0.8 (Aug 7, 2013)

  • MFSA 2013-75 Local Java applets may read contents of local file system
  • MFSA 2013-73 Same-origin bypass with web workers and XMLHttpRequest
  • MFSA 2013-72 Wrong principal used for validating URI for some Javascript components
  • MFSA 2013-71 Further Privilege escalation through Mozilla Updater
  • MFSA 2013-69 CRMF requests allow for code execution and XSS attacks
  • MFSA 2013-68 Document URI misrepresentation and masquerading
  • MFSA 2013-66 Buffer overflow in Mozilla Maintenance Service and Mozilla Updater
  • MFSA 2013-63 Miscellaneous memory safety hazards (rv:23.0 / rv:17.0.8)

New in Thunderbird 23.0 Beta 1 (Jul 4, 2013)

  • 864256 Build failure in nsMsgStatusFeedback.cpp: "error: 'class nsIXULBrowserWindow' has no member named 'S…
  • 640371 Local Inbox folder allowed to grow past 4GB by mail download
  • 856451 Make the New Mail alert show time easy adjustable
  • 852869 Remove some redundant Makefile.in files in comm-central
  • 856456 Prompts to save unmodified message forward draft (commit in bug 762594 not complete fix)
  • 810763 create test file to check proper handling/rejection of certain values input into the Account manager
  • 853135 The Attachments menu belongs under the Message menu (port seamonkey bug 352696)
  • 855057 handle account name that is a substring of another one properly in the activity manager
  • 845187 JavaScript interpreter encounters an uninitialized memory from XPCOM interface (thunderbird)
  • 523796 Eml file content change sending it as an attached file (if there is no [CRLF] at end of .eml file, T…
  • 838805 remove some small occurrences of nsISupportsArray in mailnews
  • 859287 After the toolbar customization dialog is used, the "Get Mail" pull down does not display full width…
  • 853531 Use a nicer icon for the new "New Mail" notification.
  • 813725 Top of RSS item viewing window frozen
  • 856478 remove nsISupportsArray from mailnews/extensions/mailviews/src/nsMsgMailViewList.cpp
  • 595104 Support plural forms in messenger.properties where possible
  • 856304 remove some obsolete constructs in /mailnews
  • 832034 support non-IMAP async folder create types in processNextBatch of mailWindowOverlay.js
  • 847259 (Linux) drag and drop rss feed link from browser to folderpane does nothing
  • 860966 Compile failure in msgMapiImp.cpp with Visual Studio 2012
  • 868393 Require alphabetical order when assigning to order-independent moz.build variables
  • 861867 Add new Toolbar Icons for Thunderbird.
  • 857647 Don't show balloon notification on new mail if tray icon is disabled
  • 68784 when sending mail, should first check "no recipient", then "no subject" (it's currently the other wa…
  • 869425 Move MODULE to moz.build in comm-central
  • 810675 do not needlessly preprocess some mail/ files
  • 694196 crash [@ MsgGetHeadersFromKeys(nsIMsgDatabase*, nsTArray con…
  • 868848 Build failure: [xul.dll: fatal error LNK1120: 1 unresolved externals] [DXVA2Manager.obj: error LNK20…
  • 825012 Expose methods to insert/remove indices in the m_keys array in msgDBView
  • 465731 Don't include toolbar.css in application chrome
  • 851899 fix some compiler warnings in mailnews/imap/src/nsImap*.cpp
  • 856432 Modernize the New Mail alert appearance
  • 745919 TB 11.0.forwarding plain-text (non-MIME) emails creates empty "Attached Message Part" even when forw…
  • 864192 Move EXPORTS to moz.build in comm-central
  • 866498 Radio groups for switching {View > Feed Message Body As > Original HTML|Simple HTML|Plain Text} are …
  • 837643 crash in nsMsgDatabase::ClearHdrCache
  • 869445 Configure without mozconfigs broken
  • 854536 Remove GRE_MODULE from Makefile.in's (port bug 852534 and rules.mk of bug 817076)
  • 837409 crash [@ nsImapMailFolder::AddMoveResultPseudoKey(unsigned int)], [@ nsImapMailFolder::AddMoveResult…
  • 869449 Kill off DIR_INSTALL
  • 855754 Pass current nsIURI to PGP/MIME proxy object
  • 851275 show size on disk for newsgroup folders
  • 846540 Emasculate comm-central/configure.in
  • 875472 Version 22b1 - Close/Minimize functions top right are disabled/masked when non-standard themes are u…
  • 308690 No confirmation prompt when force-deleting messages with SHIFT+DEL (currently no protection against …
  • 870307 Remove some redundant nsVoidArray includes and member variable
  • 734550 test_mailGlue_distribution.js: Services.prefs.getPref() does not exist
  • 846551 The unread count on the chat toolbar button is ugly and unreadable on a Mac retina screen
  • 877132 System integration dialog broken - Components.classes["@mozilla.org/mail/shell-service;1"] reference…
  • 507103 Composition's "Save" button remembers last "Save as" choice (draft, template, or file), but no indic…
  • 830177 Typographic fix in Account Provisioner labels
  • 679908 probing.png is missing
  • 876710 When using Personas on Mac, the title bar is overlaid by the tab bar (Address book & Compose windows…
  • 507622 remove some usage of obsolete dialogOverlay.xul in mailnews/
  • 248808 Search/filter/mailview: "date", "is after" includes messages on date
  • 872041 Mailing List does not work when entered in address box
  • 866412 Build failure: cannot convert from 'already_AddRefed' to 'nsIAtom *'
  • 856914 Add a mail services C++ helper
  • 869359 Move XPCSHELL_TESTS to moz.build as XPCSHELL_TESTS_MANIFESTS in comm-central
  • 859120 Unprefix the last -moz-linear-gradient in mail/themes
  • 431217 Send button should be disabled until we have a recipient
  • 807699 Sanitize dialog ("Clear Recent History") cleanup: unused strings
  • 859125 Clean up confvars.sh and configure.in
  • 877616 Attempting to drag a window via the title bar with a Persona enabled doesn't work
  • 863231 Send button not working properly after Bug 431217, when filling recipients via Contacts sidebar

New in Thunderbird 17.0.7 (Jun 26, 2013)

  • MFSA 2013-59 XrayWrappers can be bypassed to run user defined methods in a privileged context
  • MFSA 2013-56 PreserveWrapper has inconsistent behavior
  • MFSA 2013-55 SVG filters can lead to information disclosure
  • MFSA 2013-54 Data in the body of XHR HEAD requests leads to CSRF attacks
  • MFSA 2013-53 Execution of unmapped memory through onreadystatechange event
  • MFSA 2013-51 Privileged content access and execution via XBL
  • MFSA 2013-50 Memory corruption found using Address Sanitizer
  • MFSA 2013-49 Miscellaneous memory safety hazards (rv:22.0 / rv:17.0.7)

New in Thunderbird 21.0 Beta 1 (Apr 11, 2013)

  • The Twitter API has been updated to use v1.1, the current version (bug 857049)
  • LDAP passwords are correctly saved again (bug 833971)
  • Fix a memory leak when closing the compose window
  • Various fixes and performance improvements

New in Thunderbird 20.0 Beta 1 (Mar 21, 2013)

  • Emails can now be sent to IDN based email addresses (bug 127399)
  • Various fixes and performance improvements

New in Thunderbird 17.0.3 (Feb 20, 2013)

  • Security fixes can be found here
  • Attachments sometimes could not be removed from the composition window using the keyboard, this is now fixed (799451)

New in Thunderbird 17.0.2 (Jan 9, 2013)

  • Security fixes can be found here
  • Pressing the 'x' button on Windows now closes only one window rather than the whole application (805185)
  • An issue that caused occasional corruption in local folders after filtering is now fixed (815012)
  • An issue that caused deletion of drafts saved in IMAP folders whilst in offline mode is now fixed (805626)

New in Thunderbird 17.0 (Nov 21, 2012)

  • A Menu Button is now shown to new users by default
  • Tabs are now drawn in the title bar on Windows
  • An issue causing spell-checking only parts of words in Thunderbird 16 is now fixed (790475)
  • An issue causing Thunderbird 16 to repeatedly download emails is now fixed (806760)
  • RSS feeds can now be viewed in the Wide View Layout (531397)
  • Various fixes and performance improvements
  • Various security fixes
  • Mac OS X 10.5 is no longer supported

New in Thunderbird 16.0 (Oct 10, 2012)

  • Box.com support added to Filelink
  • Windows: Thunderbird is now easier to update with one less prompt (User Account Control)
  • Thunderbird now supports silent, background updates
  • Various fixes and performance improvements

New in Thunderbird 15.0 (Aug 28, 2012)

  • Integration of Chat with unified global search
  • Do Not Track option has been added
  • New Australis User Interface
  • Ubuntu One has been added to the list of online storage providers for Filelink
  • Various fixes and performance improvements

New in Thunderbird 14.0 (Jul 17, 2012)

  • Ubuntu One has been added to the list of online storage providers for Filelink

New in Thunderbird 13.0 (Jun 6, 2012)

  • Filelink: Send links rather than attachments and prevent bounce back due to large attachments.

New in Thunderbird 13.0 Beta 1 (May 11, 2012)

  • Filelink: Send links rather than attachments and prevent bounce back due to large attachments.

New in Thunderbird 11.0 (Mar 14, 2012)

  • New user interface with Tabs above the main menu bar to facilitate navigation and make it more contextual, and several other platform fixes.

New in Thunderbird 10.0 Beta 1 (Dec 27, 2011)

  • New ability to search the Web
  • Improvements to searching email
  • Create a new email account
  • Several fixes when drafting email
  • and several other platform fixes

New in Thunderbird 9.0 (Dec 21, 2011)

  • Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Thunderbird
  • Better keyboard handling for attachments
  • Windows users can hide the menu bar (and show it with the "alt" key)
  • Several user interface fixes and improvements
  • and numerous other platform fixes

New in Thunderbird 9.0 Beta 1 (Nov 17, 2011)

  • Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Thunderbird
  • Better keyboard handling for attachments
  • Windows users can hide the menu bar (and show it with the "alt" key)
  • Several user interface fixes and improvements
  • and numerous other platform fixes

New in Thunderbird 8.0 (Nov 8, 2011)

  • Thunderbird is based on the new Mozilla Gecko 8 engine
  • Add-ons installed by third party programs are now disabled by default
  • New Search and Find Shortcuts
  • Improved accessibility of the attachment list
  • Folder switching pane widget removed
  • Numerous platform fixes to stability
  • Fixed several security issues

New in Thunderbird 8.0 Beta 1 (Oct 5, 2011)

  • Add-ons installed by third party programs are now disabled by default
  • Added a one-time add-on selection dialog to manage previously installed add-ons
  • Improved accessibilty of the attachment lists
  • Several user interface fixes and improvements
  • and numerous other platform fixes

New in Thunderbird 5.0 Beta 1 (Jun 3, 2011)

  • New Addons Manager and extension management API (user interface will be changed before final release)
  • Tabs can now be reordered and dragged to different windows
  • Revised account creation wizard, offering improved set-up
  • Attachment sizes now displayed along with attachments
  • New troubleshooting information page to aid supporting and diagnosing problems in Thunderbird
  • Plugins can now be loaded in RSS feeds by default
  • Various other user interface fixes and improvements
  • Support for Mac 32/64 bit Universal builds (Thunderbird Beta will no longer support PowerPC on Mac)
  • and numerous other bug fixes

New in Thunderbird 3.3 Alpha 3 (Mar 16, 2011)

  • Tabs can now be reordered and dragged to different windows
  • Revised account creation wizard, offering improved set-up
  • Plugins can now be loaded in RSS feeds by default
  • and numerous other bug fixes

New in Thunderbird 3.3 Alpha 2 (Jan 21, 2011)

  • Notable changes in Miramar Alpha 2 from Miramar Alpha 1
  • New Troubleshooting information page to aid supporting and diagnosing problems in Thunderbird
  • Notifications of add-on installation progress and issues now work correctly
  • Attachment reminder now works again
  • Attachment sizes are now available in the compose window
  • and numerous other bug fixes
  • Notable changes in Miramar Alpha 2 when compared to Thunderbird 3.1
  • New Addons Manager and extension management API (user interface will be changed before final release)
  • Attachment sizes now displayed along with attachments
  • Several user interface fixes for Windows Vista/Windows 7
  • Support for Mac 32/64 bit Universal builds ( will no longer support PowerPC on Mac)
  • Over 280 platform fixes to improve performance and stability