Thunderbird 5

[Dragos]

Thunderbird Beta, available now for download, is built on top of the Gecko platform. While this milestone is considered to be stable, it is intended for developers and members of our testing community to use for evaluation and feedback. Users of this latest beta version of Thunderbird should not expect all of their add-ons to work properly with this milestone.

Notable changes in Thunderbird Beta

• New Addons Manager and extension management API (user interface will be changed before final release)
  
• Tabs can now be reordered and dragged to different windows
  
• Revised account creation wizard, offering improved set-up
  
• Attachment sizes now displayed along with attachments
  
• New troubleshooting information page to aid supporting and diagnosing problems in Thunderbird
  
• Plugins can now be loaded in RSS feeds by default
  
• Various other user interface fixes and improvements
  
• Support for Mac 32/64 bit Universal builds (Thunderbird Beta will no longer support PowerPC on Mac)
  
• and numerous other bug fixes
  

Download