Download Mozilla Thunderbird 5.0 Beta 1

The Mozilla Foundation has released a new development version of Thunderbird. The version number 5.0 beta comes as a bit of a surprise, because previously we were still at 3.3 alpha. 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 5 includes a new add-on and extension manager, now also shows how large attachments are and is more compatible with the Windows Vista and Windows 7 user interface. The release notes for this version can be found below.

The latest version of Thunderbird Beta has the following changes:

• 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