http://bugs.winehq.org/show_bug.cgi?id=10278
--- Comment #5 from Roderick Colenbrander thunderbird2k@gmx.net 2007-11-03 08:20:55 --- Created an attachment (id=8947) --> (http://bugs.winehq.org/attachment.cgi?id=8947) possible fix
I have no idea what the exact issue is but this patch could fix it.