Mozilla Messaging has released Shredder (Thunderbird 3) Beta 1 today. This milestone is focused on testing the core functionality of the new features and platform changes that will be included in Thunderbird 3. Thunderbird 3 Beta 1 includes new database technology that will make it possible to build fast new ways of navigating mail. For more background and for previews of experimental add-ons, visit this blog post.

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

• Tab interface for Mail
• Improvements to IMAP for faster message viewing
• Improved message reader view
• New Add-ons Manager
• Improved Address Book interface
• Improved import of mail from other Mail clients
• Integration with Windows Vista search
• Integration with Mac OS X Address Book

Source: David Ascher