From the New Mail! dept.:
It's alive! Mozilla has released the first alpha version of its upcoming Thunderbird 3.0, the company's next-generation e-mail application. We don't suggest you rush out and download it unless you're a true early adopter; this release isn't stable and lacks many of the features planned for Thunderbird 3's final release.

This alpha release is primarily intended to let Thunderbird fans know that the project is alive and well and the team is working hard on the next version of the open source e-mail client. It's also the first product to emerge from the newest entity within the Mozilla organization, Mozilla Messaging. The company was spun off this past winter in order to give more attention to the Thunderbird project, which had long lived under the shadow of the much more successful Firefox browser.

blog.wired.com

Download