So after downloading the thunderbird 2 archive from the mozilla site, I tried to upgrade/install over the thunderbird 1.5 that came with Bianca.
Here was my process:
run nautilus as su, archive mozilla-thunderbird.1.5
unarchive t-bird 2.0
copy all 2.0 into the 1.5 folder.
run tbird -> nothing.
so I deleted the mozilla-thunderbird folder, unarchived my 1.5 archive and now t-bird won't run. any thoughts on how I can recover my 1.5 or even finish the upgrade to 2.x?