Active Directory: Domain and Forest Functional Levels.

Just for reference: Numerical 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
 
 
 

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