The latest version of Thunderbird can be downloaded from Softpedia
Mozilla released Mozilla Thunderbird 20.0 Beta 1 for Linux, an email and RSS client, featuring numerous bug fixes and improvements.Mozilla has announced a while ago that the development of thunderbird will cease in the near future, but, for now, they are adding quite a lot of new stuff.
Highlights of Mozilla Thunderbird 20.0 Beta 1:
• Users can now send emails to IDN-based email addresses;
• POP3/IMAP/News/LDAP server validation is now required;
• The "Recent" submenu of folder picker will now share the class of the parent menu;
• Clicking at the top edge of screen will now select a tab, when the application is maximized.
Check out the official release notes for more details about this release.
Download Mozilla Thunderbird 20.0 Beta 1 right now from Softpedia. Remember that this is a beta version and it should NOT be installed on production machines. It is intended for testing purposes only.