Mozilla has merged Thunderbird 10 on the to the Beta developmental channel on December 23rd, 2011. Existing Thunderbird Beta users can update via Help > About Thunderbird. New users can get Thunderbird Beta from Mozilla’s Future of Thunderbird site.
What’s New in Thunderbird Beta
- 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
Thunderbird 10 is scheduled for release on January 31st, 2012.
Lighting users: You will need to go here and get the version 1.2 of Mozilla Lightning.