Active Directory indicates that user is homed on a different server but user data exists on this server as well. Active Directory ...

Active Directory indicates that user is homed on a different server but user data exists on this server as well.

Active Directory Object with guid %1 and SipUri %2 is listed as being homed on an unknown server.
Cause: It is possible that the Active Directory attribute msRTCSIP-PrimaryHomeServer has been incorrectly modified or the user has been improperly re-homed using outdated administration tools.
Resolution:
Move the user back to this server and then move it again to its desired server or use the latest administration tools and move the user back to this server.