Download Mozilla Thunderbird 3.3 alpha 3

The Mozilla Foundation has released the third alpha release of Miramar, or Thunderbird version 3.3. Mozilla Thunderbird is an open source mail and newsgroup client with features such as support for various mail and news accounts, a junk mail filter, spell checker and a customizable appearance. Version 3.3 is based on version 2.0 of the Gecko layout engine and also includes a new add-on and extension manager, now also indicates the size of attachments and is more compatible with the Windows Vista and Windows 7 user interface. The release notes for this version can be found below.

What’s New in Miramar Alpha 3

Miramar Alpha 3 is built on top of the Gecko 2.0 platform. The main goals of this release is to find out about possible problems caused by the changes in the underlying platform.

Notable changes in Miramar Alpha 3 from Miramar Alpha 2

• Tabs can now be reordered and dragged to different windows
• Revised account creation wizard, offering improved set-up
• Plugins can now be loaded in RSS feeds by default
• and numerous other bug fixes

Notable changes in Miramar Alpha 3 when compared to Thunderbird 3.1

• New Addons Manager and extension management API (user interface will be changed before final release)
• Attachment sizes now displayed along with attachments
• New troubleshooting information page to aid supporting and diagnosing problems in Thunderbird
• Several user interface fixes for Windows Vista/Windows 7
• Support for Mac 32/64 bit Universal builds (Miramar Alpha 3 will no longer support PowerPC on Mac)
• Over 390 platform fixes to improve performance and stability

For a more detailed list of bug fixes, see the the full bug list.