We're looking at providing hosted Exchange 2010, Sharepoint 2010 and CRM 2011 I know I need to provision seperate machines for these services but I was wondering if they will all live happily in the same AD domain and share domain controllers? Thanks

1. Exchange can share domain controllers with other apps. It does depend on the load of your exch server and you should plan the ratio of DC required including the hardware specs of the DC. Need to check with the other apps how they interact with a DC and the resources they use. 2. Also, as exch is 64bit it would also be beneficial to have 64bit DC. 3. You may need a dedicated DC's for exch and I would have more than one in each AD site where you have exch and make sure it;s not a RODC. http://technet.microsoft.com/en-us/library/dd346701.aspxSukh