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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

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • 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
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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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