Can I add windows 2008 sp2 domain controller to a domain with forest functional level Windows 2008 R2?
We recently set the FFL to Windows 2008 R2, but now have discovered that an app needs a Windows 2008 SP2 domain controller, that we just took down.
Can I add that Windows 2008 SP2 domain controller back into a domain now set at Windows 2008 R2?
I would upgrade that DC to Windows 2008 R2 before adding it to the domain, but its a VMware virtual server and previous attempts to upgrade out virtual DC's to Windows 2008 R2 and resulted in crashed servers.