Thunderbird 3 beta 3 is now available to download for Windows, Mac, and Linux users. The beta introduces some significant improvements to the open-source desktop client, from performance to interface.
The new beta is built on Mozilla's Gecko 1.9.1.1 platform, keeping it up to date with the latest changes that affect Firefox. Mozilla also claims that there are more than 500 changes in this version, and hints at more alterations to come by stating in a press release that many of them are ''laying the groundwork for future changes''. On his blog, Chief Technical Officer of Mozilla Messaging Dan Mosedale said that many of the improvements will help support the new global database search engine. Based on these comments, more betas of Thunderbird 3 are expected.
The interface and behavioral changes in this beta are significant and should be easy to spot for longtime 'bird-watchers. The biggest is that Thunderbird now supports e-mail tabs. If you've checked out the highly unstable Shredder version of Thunderbird, or Postbox, a competitor that's based on Thunderbird's own open-source code, you've known that this feature has been due for a while.
Thunderbird 3's latest beta out now | The Download Blog - Download.com