Upgrade DC from Server 2003 to 2008 First or Add New 2008 DC First?

I currently have one DC that is Windows Server 2003.  I want to add a second DC with 2008 r2.  I also want to upgrade the 2003 server to 2008 r2.

What is the correct order to accomplish this task?  Upgrade the 2003 first?  Add the new 2008 r2 server first then upgrade the 2003?  Something else?

Thanks
Drafter421Asked:
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Glen KnightCommented:
Add the new server to the domain as a member server.

Then prepare the domain for Windows 2008 by running the following:

•Open a command prompt (Start > Run > CMD) and run the commands below
NOTE: X: refers to the drive letter that has been assigned to your DVD Drive.
•X:\support\adprep\adprep32  /forestprep
After the above command you will be prompted to confirm you wish to proceed by typing the letter C and pressing Enter
•X:\support\adprep\adprep32  /domainprep
•X:\support\adprep\adprep32  /domainprep /gpprep
•X:\support\adprep\adprep32  /rodcprep

You can then run DCPROMO on your new server and make it a domain controller.

Once done, transfer the FSMO roles and remove it as a Global Catalog server along with any other services running on the 2003 server and you are then ready to demote it.
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DavisNTCommented:
This is not so easy to answer question, because upgrading domain may interfere with user PCs and other servers.
I suggest you to do a little digging/research in the internet about this topic!
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Glen KnightCommented:
Adding an additional DC will have no effect on your users and PC's, I haver known this to cause network disruption and I have done literally hundreds.
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danielmarkoCommented:
you could also read the Nov 30 2011  Microsoft artical on the upgrade.
http://technet.microsoft.com/en-us/library/upgrade-domain-controllers-to-windows-server-2008-r2(WS.10).aspx
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Ayman BakrSenior ConsultantCommented:
You can do any of the options; however as you have only one DC in your domain you don't want to risk the possibility of being out of operation in any issue that might happen.

Therefor I agree with demazter and would first add 2008 as a member server, prepare the domain, promote the new server and then upgrade your old server.

For a more thorough guideline check this: http://technet.microsoft.com/en-us/library/cc731188(v=WS.10).aspx
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Drafter421Author Commented:
Thank you all for your quick responses.
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