I can map a drive in Mac OSX 10.7.1 (Lion) via the "Connect to Server" for any share that is \SERVER\share
However, our users' private network drives are \SERVER\usershare\username and they map to that level, not the share name itself, because they have no NTFS permissions at the share level.
So in Window it is:
net use x: \server\usershare\dave (or the GUI equivalent)
However, in the Mac OS it doesn't like trying to connect/map to below the share itself.