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I am being asked to turnup a windows 2003 R2 domain controller in a Windows 2008 R2 forest. The company is too cheap to get another license for 2008 r2 and wants a second DC.

The functional level of the current domain / forest is windows 2003. What issues if any will I run in to?

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migrated from stackoverflow.com Mar 15 '11 at 4:38

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What does "turnup a..." even mean? It's not a technical term I'm familiar with. –  John Gardeniers Mar 15 '11 at 7:01

1 Answer 1

You're confusing your terminology (and in turn, me!). You say you have a Windows 2008 R2 forest and then go on to say your domain/forest is Windows 2003. Please could you clarify what your domain and forest functional level really are.

If your domain and forest functional levels really are 2003, you'll have no issues. We've been running with 1 2008 R2 and 1 2003 Domain Controller for some time with no issue.


If however your domain/forest level is 2008, basically you're out of luck.

You should give this Technet article a read on Active Directory functional levels. I'll call out the relevant bit for you (emphasis mine).

  • After the domain functional level is raised, domain controllers running earlier versions of Windows Server cannot be introduced into the domain. After the forest functional level is raised, domain controllers running earlier versions of Windows Server cannot be introduced into the forest.
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