Download: Thunderbird 2.0 binary RPM
Thomas Chung over at FedoraNews.org has a spiffy RPM Spec file he’s been updating for each release of thunderbird through 1.5. As it turns out the only change needed to update for version 2.0 is incrementing the version line in the file. Download the spec file and update line 2 such that it reflect the version you’re packaging.
You’ll also need the Desktop/Menuitem metadata file, the 
Thunderbird Icon and of course, the Thunderbird binary package from Mozilla.org.
Follow Thomas Chung’s detailed instructions and even the most novice Linux user should be able to build a Thunderbird RPM. I’ve been using this method for every Thunderbird release since 0.7 to bridge the gap between the release and the date the Fedora project updates their RPM repositories. With this 2.0 release, I’m quite impressed at the noticeable performance improvement I’m seeing. I highly recommend building a Thunderbird RPM using this method and possibly sticking with it rather than moving to the fedora RPM even when it becomes available.