From: Craig on
Here it is.

> Thunderbird 3.1 is now available for free download
>
> Mozilla Messaging is proud to announce that Thunderbird 3.1 is now
> available for download. Thunderbird 3.1, based on the Gecko 1.9.2
> platform, was built by a community of passionate contributors,
> experienced developers, security experts, localization and support
> communities, and thousands of active testers.
>
> Some of the new features:
>
> * New Quick Filter toolbar
> * New Migration Assistant
> * Saved Files Manager
> * Several fixes to improve upgrading from Thunderbird 2
> * Several design improvements and corrections to the interface
> * Stability, memory, and password handling improvements

<https://developer.mozilla.org/devnews/index.php/2010/06/24/thunderbird-3-1-is-now-available-for-free-download/>

--
-Craig