THis is my setup. I have two NT4 servers. The PDC currently is running Exchange 5.5 and primarily is doing all of the work. Shares, Access databases, Exchange, and also my common files. I want to bring down the old PDC and add the new server. I don't want to frig things up... thus my posting. I understand the promote and demote PDC and BDC thing but not fully. Before removing (Unplugging) the BDC do I need to do something in user manager? Hopefully this is enough information to get you started.