My Forest Functional Level is 2003. I am adding a new Domain Infrastructure. Can I use 2012 R2 for the new DCs? Or do I need to go for Server 2008 R2?

What are the Server version and Domain/Forest Functional Level compatibility restrictions?

closed as unclear what you're asking by HopelessN00b, Ryan Ries, kce, kasperd, DKNUCKLES Jun 6 '14 at 14:27

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  • What? Seriously, what are you asking? – HopelessN00b Jun 6 '14 at 0:26
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    @HopelessN00b I think he's asking whether he can install domain controllers that run a Server 2012 R2 OS into a domain with a 2003 forest functional level as well as existing domain controllers that run Server 2003. And what he'll be missing out on by staying at a forest and domain functional level of 2003 as opposed to upgrading FFL/DFL to 2012 R2. – Ryan Ries Jun 6 '14 at 0:29

If you had out the tiniest amount of effort into research before asking, you would have found that the answer is yes. You can promote 2012 R2 Domain Controllers into a 2003 DFL domain.

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