Upgrading Domain and Forest Functional Levels
Windows Server 2012 AD DS does not immediately begin functioning at a new level, even when all DCs have been migrated. The domains and forest will be at the original functional levels. You first need to upgrade the functional level of the domain to Windows Server 2012 before you can realize the full advantages of the upgrade. See Chapter 4 for a detailed discussion of the forest and domain functional levels.
Note
The act of raising the forest or domain functional levels is irreversible. Be sure that any Windows Server 2003/2008 R2 DCs do not need to be added anywhere in the forest before performing this procedure.
After all DCs are upgraded or replaced with Windows Server 2012 DCs, you can raise ...
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