Process w3wp.exe () (PID=3260). Exchange Active Directory Provider could not find an available domain controller in domain DC=xxxxx,DC=xxxxx. This event may be caused by network connectivity issues or configured incorrectly DNS server. This event may also occur if you have not configured correctly your multiple Active Directory sites.
The problem is the domain listed that it is looking for was an old domain left behind that no longer exists. Is there a way to have Exchange stop looking for it?