I take it the server is in application mode then?

This being the case it does explain why not having the licensing service running may be keeping the Mac off.... It isn't licensed. The Win2k and XP Pro(?) machines are by their nature.... Your Mac probably isn't and will probably require the purchase of a license and entering that licanse into the licensing service..... have the user buy it and slap him for being so silly as to purchase a machine that is non-native to your environment and then expect you to jump through hoops to make it work for them..... Alternatively, smile sweetly as you tell them that under the amendment to the AUP the IT department no longer supports anything but windows products and they need to call Mac....