We had: 1) 1 Windows Server 2003 running Active Directory services to manage logon and permissions for file sharing. 2) 15 workstations. We now want to have: 1) 1 Windows Server 2008 R2 server running Active Directory services to manage logon and permissions for file sharing. 2) 15 same workstations, with their same user profiles. So I joined the 2008 R2 server to the domain, and then used the dcpromo tool to make it a domain controller. Problem is, whenever I take the old server offline, (the 2003 one) everything flips out, logons are slow, and the 2008 server gives people trying to access shared files weird errors like that the server that authenticated them cannot be contacted, and asks them to log in again with their username and password before accessing shared files on the server. What did I do wrong? I must be forgetting something.