More than half a year since the folks at Mozilla Messaging released the first alpha version of Thunderbird, the team has released Thunderbird 3 Beta 1. The latest release features a bunch of bug fixes and some new features, including:

• A tabbed interface for mail
• Integration with Windows Vista Search
• Integration with the Mac OS X Address Book
• IMAP improvements for faster message viewing

You can also use the Add-ons Manager to search for, download, and install plugins and themes much the same way you can with the Firefox 3 Add-ons manager. You can find more improvements in the release notes.

Thunderbird 3 Beta 1 is available for Windows, Mac, and Linux.