Mozilla Lightning is a redesign of the Calendar component. Its goal is to tightly integrate calendar functionality (scheduling, tasks, etc.) into Mozilla Thunderbird.
Mozilla Lightning Project has the following other editions available: Mozilla Lightning Project for Windows and Mozilla Lightning Project for Linux.
Product's homepage
Here are some key features of "Mozilla Lightning":
· Better Thunderbird integration
· emailtask linkage
· Integration with the Thunderbird address book
· iMIP support (meeting invitations)
· Improved CalDAV support
· Cached calendar support for offline calendar use
· Device synchronization
Requirements:
· Mozilla Sunbird