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Active Directory: Domain and Forest Functional Levels.

Active Directory - Domain and Forest Functional Levels. Domain versioning (and DC) 0 = Mixed mode / Native mode 1 = Windows Server 2003 interim domain mode 2 = Windows Server 2003 3 = Windows Server 2008 4 = Windows Server 2008 R2 Forest versioning 0 = Window 2000 1 = Windows Server 2003 interim forest mode 2 = Windows Server 2003 mode 3 = Windows Server 2008 4 = Windows Server 2008 R2