Hi,It is possible to implement the following configuration:Exchange 2007 with CCR with the following services on each nodeServer 1 . Domain Controller. DNS. DHCP Server 1 . Domain Controller. DNS. DHCP And yes, I know that its not recommended, but I only want to know if it is possible. Best regards,RG

In Exchange 2000/2003 it's not support when DC run as a Cluster node. http://support.microsoft.com/kb/898634/ In the follow link point this is not support (When you run Exchange Server Analyzer Tool in Exchagne 2007) http://technet.microsoft.com/en-us/library/aa998407(EXCHG.80).aspx More information about DC run as cluster node please reference this KB http://support.microsoft.com/kb/281662

Thanks