Our environment is such: 2 Windows Server 2008 Non R2 domain controllers. Domain Functional Level is at 2003 because we have an Exchange 2003 mail server (We are in process of upgrading it).
I need to add a Windows Server 2008 R2 Domain Controller. Can this be added without affecting the other 2 2008 non R2 DC's or having to raise the domain functional level? Or will I have to run dcprep on the NON R2 DC's? Please advise.