When I close Thunderbird, it never update message files nor delete .parentlock. So at next start it refuse to start and I need to remove parentlock. And then it start, but all mail received before are read again and mark unread.
I use openSUSE 11.1 x64 and profile are on a samba share.
I have migrated from Mandriva where this config work without problem.
I found that the problem come from samba. I can create or remove file but not write file. There is no lock on samba server when I open file on openSUSE client.