After the preview release did not reveal any bigger problems, I uploaded thunderbird 1.0.2-1 to sid. Nevertheless, a grave bug revealed a bug that I could track down to hopefully solve all those nasty unreproducible upgrade problems.
Thus, 1.0.2-2 is IMHO a great release, so upgrade soon! For testing you can as usual grab the current release from my preview archives … oh, unfortunatly my server hosting the archive is currently down
. See the current sticky announcement about this.