While much of the focus at Mozilla is put on FireFox, Thunderbird is one of their most popular products that many people enjoy as a mail client. Slower to updates than other Mozilla software, many people will be happy to learn that you can now try out the version 2.0 Alpha
. Of course, alpha software is strictly for testing purposes only while the team further develops the product. Definitely don't switch your mail client now, though if you are wanting to get a sneak peak there's nothing stopping you from doing such.
A beta is scheduled for release in August, with the final 2.0 release planned for “late fall” of this year. A lot of enhanced features are being added to the program, including better extension support and a function similar to grouping that makes emails appear as conversation threads. The alpha is available for download
at Mozilla's site.