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?

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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!
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.
Determine the Perfect Price for Your IT Services

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden with our free interactive tool and use it to determine the right price for your IT services. Download your free eBook now!

you could also read the Nov 30 2011  Microsoft artical on the upgrade.
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
Drafter421Author Commented:
Thank you all for your quick responses.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.