The first release candidate of the email client Mozilla Thunderbird 3.1 has just been released and is now available for download at the official Mozilla Messaging site and direct update via the update check in the desktop email client.
Thunderbird 3.1 will replace the Thunderbird 3.0 branch once it is released introducing several new features in the email client including better message filtering, a saved file assistant and improved memory handling and stability.
The fixed bugs list of Thunderbird 3.1 RC 1 lists 54 issues that have been resolved in this new release including one blocker, eleven critical and four major ones.
Most critical issues that have been fixed were crash related but there are also minor fixes for better IMAP handling, interface and quick filter bar.

The email client release is considered stable by the developers but it still aims largely at developers and testers and not general users who are asked to wait until the final version of Thunderbird 3.1 is released before they migrate to the new client.
More information about the release are available at the blog post announcement, release notes and bugzilla.
Thunderbird 3.1 RC 1 is available for download for all supported operating systems and languages at the Mozilla website.
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I run it since alpha1 (Lanikai) without a problem in my productive home environment. When it is released, I will go for 3.2 alpha, when it is available.
I also run it since alpha1 without a problem… but somehow I still cannot decide if I like it better than Outlook. Mostly the little things – e.g. press Esc to cancel the composition of a new email and other hotkeys are pretty good at Outlook and on the other hand the addons in Thunderbird aren’t that useful for me.