To update the forest functional level, the domain controllers in the forest must be running the appropriate version of windows, ...

To update the forest functional level, the domain controllers in the forest must be running the appropriate version of windows, and no domains in the forest can have a domain functional level of Windows 2000 mixed or Windows Server 2003 interim.    Forest root domain name  %s    Current forest functional level
English
English (United States)
日本語
Japanese