I have recently installed Exchange 2003 onto a new box running Server 2003 Enterprise. There are 2 other servers on the domain, one is a primary DC and the other is a secondary. Both machines are running Server 2000. After installing Exchange I found out that the primary DC has to be running Server 2003 also inorder to use RPC over HTTP. When trying to upgrade the primary DC from Server 2000 to 2003 Enterprise I get a warning saying that i need to run adprep /forestprep. I have run the command per the instructions in the warning and it said that it was sucessful. I have not restarted the server, though. Now when trying to upgrade I get the same message. Should I move ahead anyway?