"Following on the heels of the Firefox 2.0 beta in mid-July,
Mozilla has released the first 2.0 previews of its Thunderbird
email client. Firefox may get most of the attention, thanks to its
flashier job, but it is the trusty email reader that conducts most
of the killer-app conversations on a daily basis. Let's see what
the new build holds in store.
"Thunderbird binaries are available for i386 Linux, Mac OS X,
and Windows. I tested the 2.0 alpha build on Ubuntu Dapper Drake.
As with any email client, you should always make a backup of your
messages before installing a new version--especially so on
pre-release software like this. Also, be aware that most extensions
built for Thunderbird 1.5 will not work in 2.0 preview