Mozilla Messaging has released the next version of Thunderbird on April 24th, 2012. For information about what’s new and fixes in Thunderbird 12, see the release notes. Users can update via Help > About Thunderbird, or download and update manually via getthunderbird.com site. The next scheduled release is Thunderbird 13 on June 5th which may be the last version to support Windows 2000 and XP SP1 or older. Important: Thunderbird 3.1.x is no longer supported.