Mozilla Messaging release the scheduled update for Mozilla Thunderbird on March 14, 2012. Changes/fixes in Thunderbird 11.0:
- Tabs on top – facilitates navigation and make it more contextual
- Various security fixes
- (Mac) Fixes issue with Thunderbird notifications may not work properly with Growl 1.3 or later (Bug 691662)
- (Windows) Fixes a crash seen during importing of Microsoft Outlook profiles (Bug 723105)
- Unresolved Known Issue: If you are unable to view content for your RSS feeds in the Wide View Layout, you may need to disable the Lightning Calendar add-on if you have it installed or switch to Classic View and restart Thunderbird. (see Bug 531397)
Thunderbird 10.0.X user can update via Help > About Thunderbird or user can download and manually install Thunderbird 11.0 via getthunderbird.com. Next release will be Thunderbird 12.0 on April 24th, 2012.