Mozilla Thunderbird 0.1 was relased today. See the Thunderbird 0.1 Release Notes for information on what's new, installation, and known issues. Great work, mscott!!
If you haven't tried Mozilla Thunderbird yet, I suggest you take the plunge. It's light and fast and does pretty much everything that Mozilla Mail does (including junk-mail filtering) along with a few great features of its own like a new 3-pane view and customizable toolbars. Thunderbird is based on current Mozilla Mail code so even though its version number is still very low, all of the core technologies are quite mature and I haven't had anything like dataloss with any of the recent Thunderbird nightly builds.
