From: sawyer on

I currently have exchange 2007 sp2 up and running. One server is running
HT+CAS and the other server is a mbx server. I recently setup an exchange
2010 CAS+HT server. After the install completed successfully, I was
surprised to see that I couldn't see the 2007 servers using the 2010
management console, and I also couldn't see the 2010 servers using the 2007
management console. Is this normal? I confirmed that all servers are located
in the same exchange org