Thunderbird 5.0 Beta 1

Thunderbird is a great email client from the same people who brought you the Firefox browser.

Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

Tabbed email
An Archive feature similar to the one in GMail
Lightning fast search
Smart folders

Changelog:

* 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: Thunderbird 5.0 Beta 1 | 13.8 MB (Freeware)
View: Release Notes | Thunderbird 5.0 Website