Windows 2008R2 Domain Controller

Hello,

Our environment is such: 2 Windows Server 2008 Non R2 domain controllers.  Domain Functional Level is at 2003 because we have an Exchange 2003 mail server (We are in process of upgrading it).

I need to add a Windows Server 2008 R2 Domain Controller.  Can this be added without affecting the other 2 2008 non R2 DC's or having to raise the domain functional level?  Or will I have to run dcprep on the NON R2 DC's?   Please advise.
ozzalotAsked:
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Chris HInfrastructure ManagerCommented:
Yes.

It will run in 2003 functional level no problem.
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Mr TorturSystem EngineerCommented:
Hi,
+1, it will work without affecting existing 2008R1 DCs and domain level.
It seems (a little surprising to me..) that you even can have a RODC, which is a windows 2008 option :

https://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels(v=ws.10).aspx
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Scott CSenior Systems EnginerCommented:
Even a Server 2012 R2 will work in a functional level of 2003.

You are aware that with Exchange 2003 you cannot upgrade directly to Exchange 2013 right?  

If you are going to Exchange 2013, your best option is to go to Exchange 2010, remove the Exchange 2003 machine(s) then upgrade to Exchange 2013.
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ozzalotAuthor Commented:
Thank you all for your feedback.  

ScottCha,  Thanks for the great tip on Exchange upgrade path.  I'll keep that in mind when when decide to upgrade exchange after this.
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Scott CSenior Systems EnginerCommented:
Sure thing.   Didn't want you trying to install Exchange 2013 and being surprised when the install stops.

If Exchange 2013 detects Exchange 2003 or earlier in an environment, the install will not continue.
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