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

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.

ASKER CERTIFIED SOLUTION

Lee W, MVP

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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

https://www.experts-exchange.com/questions/26358376/Upgrading-windows-2003-domain-controllers-to-Windows-2008-DC.html

Thanks

Mike

SOLUTION

Darius Ghassem

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JJENSEN3

ASKER

Is adprep and so forth run on the 2008 server?

Lee W, MVP

I assume you mean 2008 R2 server:
http://www.petri.co.il/prepare-for-server-2008-r2-domain-controller.htm

If you REALLY mean 2008 (non-R2) then:
http://www.petri.co.il/windows-server-2008-adprep.htm

Darius Ghassem

If you are going to R2