Will the certificate service and exchange 07 co-exist on the same machine?

Dear customer: Yes, of course. You can install certificate server on your Exchange server 2007. Note: after installing certificate service, the machine name and domain membership may not be changed due to the binding of the machine name to CA information stored in the Active Directory. Changing the machine name or domain membership would invalidate the certificate issued from the CA. please ensure the proper machine name and domain membership are configured before installing certificate service. Hope it helps. If anything is unclear, please feel free to let me know. Rock Wang - MSFT