Can server 2008 be a domain controller when all existing domain controllers are 2008 R2

Hi all, I have one domain with all domain controllers as 2008r2. Here is the question, can I add a server 2008 domain controller or does it have to be R2 ?
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Jason ThomasAsked:
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MarcusSjogrenCommented:
yes - that is indeed possible, but I think you should read the below thread and related articles as they might give you some more information about it.

The only thing I am unsure about is whether you can have the 2008 R1 raised to full 2008 R2 forest functionality.

http://social.technet.microsoft.com/Forums/windowsserver/en-US/5702dc74-645e-43c5-be7a-7e2c62d83c52/can-i-have-a-2008-r1-domain-controller-with-a-2008-r2-domain-controller?forum=winserverDS
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McKnifeCommented:
It depends on the domain and forest functional level. If that is set to 2008R2, you cannot use 2008 "R1", and you cannot change that, either.
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Brad GrouxSenior Manager (Wintel Engineering)Commented:
As McKnife said, it depends on your domain's Forest Functional Level (FFL). The FFL can only support equal or "newer" versions of Windows, FFL is NOT backwards compatible.

As an example, a 2008 FFL can support 2008, 2008 R2, 2012 and 2012R2 - but it can't support 2000 or 2003. NOTE: I am speaking of Domain Controllers ONLY. A 2008 FFL can support all versions of Windows servers.

To verify the functional level of your domain and forest follow these steps:
1. From the Administrative Tools menu, select Active Directory Domains and Trusts.
2. Right-click the root domain, then select Properties.
3. Under the General tab, the Domain functional level and Forest functional level is displayed on the screen.
Forest Functional Level
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Jason ThomasAuthor Commented:
Many thanks chaps. My domain is 2008r2 so can't use the 2008 DC . Learnt a lot here from all answers so many thanks.
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