Mozilla Messaging release the scheduled update for Mozilla Thunderbird 3.1.x branch on March 14, 2012. This release addressed security issues. Thunderbird 3.1.X user can update via Help > Check for Updates or user can download and manually install Thunderbird 3.1.20 form here. Next and final release for Thunderbird 3.1 will be Thunderbird 3.1.21 on April 24th, 2012.

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…