We're updaing all our servers and I just finished installing Exchange Server 2010 yesterday. Today I tried to take an old domain controller off line and when I did I got an error in Excg Manager: An error caused a changed in the current set of domain controllers. It was running the command ‘Get-ReceiveConnector –Identity ‘SERVER3\Default SERVER3” Do I have to do something to Exchange Server before I can take a Domain Controller offline? Thanks.

Check out: http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/cb231da0-2b06-41ce-9f4a-f11d408cf07f

Are you demoting the DC as a member server? If so, check each Active Directory Site to ensure that it's not trying to synchronize with any other DCs.

Are you demoting the DC as a member server? If so, check each Active Directory Site to ensure that it's not trying to synchronize with any other DCs.