> When I upgraded to AD from NDS I did not really understand the > ramifications of using one of my public domain names as our AD domain > name, nor did the service integrator I engaged. Nor did they realise > that exchange should not be installed on a DC. As such I am now > planning a domain rename, as well as demoting the DC with exchange to a > member server, Well, I hate to be the bearer of bad news, but demoting a server that is both a DC and Exchange will cause additional problems. (Like you really want more.) The problem is Exchange has to connect to a DC, and one that is a GC. If Exchange is installed on a DC, it will look to itself for AD only. You will need to research this as there are KB on how to change the DC Exchange looks for. John Tolmachoff Engineer/Consultant/Owner eServices For You