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

Posted on 2011-05-03
Medium Priority
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
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Accepted Solution

Lee W, MVP earned 1000 total points
ID: 35516461
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
ID: 35516471
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



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Assisted Solution

by:Darius Ghassem
Darius Ghassem earned 1000 total points
ID: 35516631
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

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Author Comment

ID: 35724308
Is adprep and so forth run on the 2008 server?
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Expert Comment

by:Lee W, MVP
ID: 35724442
LVL 59

Expert Comment

by:Darius Ghassem
ID: 35730579
If you are going to R2

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