Are a 2003 Domain Controller and a 2008 Domain Controller Allowed In the Same Domain?

Posted on 2011-05-03
Last Modified: 2012-06-21
I have two domain controllers currently:
DC - Win 2003 Server 32 bit with Active Directory
DC1 - Win  2003 Server 32 bit

DC is replicated to DC1 as a backup.
I would like to make DC1 a Win 2008 Server R2 x64.

Can I do this, meaning, can I have a 2003 DC in conjunction with a 2008 DC within the same domain? And if so, what is the best method to upgrade to accomplish this?

Thanks in advance.
Question by:JJENSEN3
    LVL 95

    Accepted Solution

    Absolutely... there is no "best method" per se... I always recommend checking the health of AD using DCDIAG, NETDIAG and so forth first... then create a backup of all DCs to be even safer... but then you just need to run ADPREP32 from the 2008 R2 DVD to prepare AD for it's first 2008 R2 DC.
    LVL 57

    Expert Comment

    by:Mike Kline
    Yes the 2008 R2 DC can happily co-exist.  You won't be able to raise the domain and forest functional levels to 2008 R2 until all your DCs are at that level.  

    Take a look at this question I helped with


    LVL 59

    Assisted Solution

    by:Darius Ghassem
    I would have to agree with Mike and leew this is fine no problems

    Here is a guide to move to add a 2008 Server as a Domain Controller

    Here is an article on the changes in adprep in windows 2008 server r2

    Author Comment

    Is adprep and so forth run on the 2008 server?
    LVL 95

    Expert Comment

    by:Lee W, MVP
    LVL 59

    Expert Comment

    by:Darius Ghassem
    If you are going to R2

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