We have recently brought in a new tenant to our office. They had their own DC running Exchange 2003. We decided to let them use our exchange server for their mail so that we would not have an issue with two exchange servers running in the same domain. They only have two workstations and they both login into their DC and then use their Outlook to connect to our Exchange Server. One workstation is working fine. The other workstation, when configuring the outlook mail client keep connecting to the old exchange server. When setting up the account, we input the new excange servers name and then the users name, when the system resolves the users name it changes the server name back to the old server.
Any help would be appriciated.