I installed the latest Alpha from the new Mozilla Messaging project known as Shredder. Thunderbird 3 will be the name when they are done, and from what I’ve heard it looks promising. After I installed it I realized I can’t live without the two extensions I have installed that don’t work with Shredder – Enigmail and Lightning. There’s tabbed browsing but it’s not that exciting and it doesn’t work that well yet. I’ll update more on this when they get something interesting going on.