I only have thunderbird installed. But I have symlinks for both mozilla-thunderbird and thunderbird
daverix@skynet:~$ ls -l /usr/bin | grep thunderbird lrwxrwxrwx 1 root root 30 2009-04-23 18:00 mozilla-thunderbird -> ../lib/thunderbird/thunderbird lrwxrwxrwx 1 root root 30 2009-04-23 18:00 thunderbird -> ../lib/thunderbird/thunderbird
I only have thunderbird installed. But I have symlinks for both mozilla-thunderbird and thunderbird
daverix@skynet:~$ ls -l /usr/bin | grep thunderbird thunderbird/ thunderbird thunderbird/ thunderbird
lrwxrwxrwx 1 root root 30 2009-04-23 18:00 mozilla-thunderbird -> ../lib/
lrwxrwxrwx 1 root root 30 2009-04-23 18:00 thunderbird -> ../lib/