I have multiple DC's that are running on Windows 2003 Standard SP1. We just bought our first Server that has Windows 2003 R2 on it. When I do the DCPROMO I get an error saying that I need to run adprep on that machine to prepare active directory. Is there anything problems I should know about this before I just run this and update AD? All of our servers are Windows 2003 Standard SP1 and we also have Exchange 2003. I am just being cautious before I run this. Thanks.