SCC (Site Consistency Checker) (aka SKCC)

The updated version of the Exchange Server 5.5 Knowledge Consistency Checker (KCC) that works in conjunction with (and is part of) the Exchange Site Replication Service to ensure that knowledge consistency of sites, administration groups and Active Directory domains is maintained when interoperating between Exchange 2000 and Exchange 5.5. When changes are detected in either environment, the SCC may adjust existing configuration connection agreements. [Exchange 2000]