I have to agree with Russ, the fact that we now have to go to two places to perform a task that should be integrated simply makes my suggestion to use CCR look stupid to the cluster team. The comment I get back is "so Microsoft implements an application that does not support the clustering standard they have implemented?". I think you need to look deeper and see why this is something that is going to be generally unpopular. From my side, the main issue I have with this relates to patching and the need to automate it out of a system such as SMS. This will require me to develop and support a stand alone proccess and checking just for Exchange, when every other MS cluster product continues to work the same way. On top of that I can not afford to be opening security up. When introducing a new technology like CCR to an organisation, this kinds of isses can make ife difficult.