Hi folks. I have a forest root domain with no services on it, and a child domain.Firstly i installed exchange 2003 on this child domain.After that installed two exchange 2007 CAS/HUB server for fault tolerance with exchange2003 bidgehead server. When i started to install scc active cluster mailbox node , i received error Cannot calculate value of property "AdminDisplayVersion" I realized that, on event viewer one of the cluster network cards couldn't register itself on dns.I dont know that is the real cause of error.But now i made a fresh os installations for mailbox passive and active node.Created windows cluster and corrected dns issue Is there any important point before installation.Should i configure anything else on exchange 2003 for adminversion error? Also when i installed 2003 and 2007 servers, on forest root ,Exchange domain servers group were created.Is ths a default behaivour?Or did i installed exchange servers on forest root?

Hello Yumatu, can you eleborate more on your infrastructure i.e windows version, exchange version (SP)?

you can read the following articles with step-by-step on how to install Exc2k7 with SCC: http://www.msexchange.org/tutorials/Installing-Two-Node-Exchange-Server-2007-Single-Copy-Cluster-Virtual-Server-Environment-Part1.html http://www.msexchange.org/tutorials/Installing-Two-Node-Exchange-Server-2007-Single-Copy-Cluster-Virtual-Server-Environment-Part2.html http://www.msexchange.org/tutorials/Installing-Two-Node-Exchange-Server-2007-Single-Copy-Cluster-Virtual-Server-Environment-Part3.html http://technet.microsoft.com/en-us/library/bb629581(EXCHG.80).aspx hope it helps?