How to kill 'no letter' UNC mapped drives...
Have you ever browsed over to another PC on your network using “network neighborhood”, and then connected to one of the file shares? Without a drive letter, how do you disconnect yourself once you’ve done so?
So if Net Use shows \\servername\sharename and no 'local' drive letter, then use net use /delete \\server\sharename to remove it.
Simple but not obvious!