Mozilla Messaging has released Thunderbird 3 beta 2 today. Thunderbird 3 Beta 2 is now available for download. This milestone is focused on testing the core functionality of the new features and platform changes that will be included in Thunderbird 3. For additional information about the new features, visit this blog post.

New features and changes in this milestone that require feedback include:

• New Activity Manager
• New ability to Archive email
• see the complete list of bugs fixed

Source: David Ascher