I set up the kix delete command, and it didn't seem to delete the Z drive. That's what I shelled to the net use. I thought that I read that kix use can only delete drives it makes. Does 'use z: /delete /persistent' do something special?

If the mapping does fail, what can you do about it during the logon? I can understand un-mapping before you attempt the map. That protects you from the dumb users, but how does catching an @error help? Go check through logs? I think I'm missing something.