I have a NT 4.0 PDC with Exchange Server 5.5. I am installing a new Win2K server on the network as my primary server replacing a NetWare 3.x server. I want the Win2K machine to be the Domain Controler , and have the existing NT box just run the Exchange Server. What would be a good approach for acheiving this? Also, do I need to change the type of domain controller that the current NT server is?