We had Windows 2000 Active Directory setup on an old workstation with Exchange 2000. We later bought a new server with dual processor and everything. We promoted the new server to Domain Controller and installed Exchange 2000 on it. We have moved everything to the new server, but we still can't get rid of the original server without losing some functionality. As soon as we bring down the old server, we can't open up the "Global Adress Book" in Outlook. Not sure if this has anything to do with the Global Catalog because I think it's still running on the original server. Any help on this is very much appreciated. We would like to have just the new server as our main server for both Active Directory and Exchange 2000.