Mozilla Messaging has release Thunderbird 3.1 based on the Gecko 1.9.2 platform, was built by a community of passionate contributors, experienced developers, security experts, localization and support communities, and thousands of active testers.
Some of the new features:
- New Quick Filter toolbar
- New Migration Assistant
- Saved Files Manager
- Several fixes to improve upgrading from Thunderbird 2
- Several design improvements and corrections to the interface
- Stability, memory, and password handling improvements
For more information and to download please see the Thunderbird 3.1 Release Notes.
Source: Mozilla Developer’s News