I want to do away with an old BDC that has been promoted to a PDC for Domain XYZ.com. It's only purpose is to authenticate logons for an Exchange 5.5 box (also NT4). I now have a 2000 PDC running the XYZ domain (not .com). What are the steps necessary to rid myself of the NT4 PDC in XYZ.com and join my Exchange 5.5 NT4 machine to the XYZ domain with the 2000 PDC handling authentication? Please be specific.