Add Windows 2003 R2 to windows 200 Domain

Good morning Experts,
Got a quick question as it has been a while since I have run into this one and just want to make sure I’m not forgetting something. I have a customer who I have finally convinced to get off of Windows 2000 Server and i have a quick question about the upgrade.

Here’s what is currently there:
Windows 2000 Server PDC
Windows 2000 Member Server with Exchange 2003!

Here is what I'm adding:
Windows 2003 R2 Standard as a DC that will eventually get all FSMO roles.
Windows 2003 R2 Standard with Exchange 2003 server that will eventually take over the current exchange 2003 server.

My main question is related to AD prep.

Are there any concerns about running AD prep on the Windows 2000 Domain with an Exchange 2003 server already in the environment? One of the other techs here at the place I work remembered there may be some issue doing this and now he has got me nervous about doing it. I don’t remember any issues off the top, but it has been a while since I have been dealing with Windows 2000 Server especially with an Exchange 2003 server in the mix.

If you think of any other concerns even with something else just let me know!

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Abhay PujariCommented:
Are there any concerns about running AD prep on the Windows 2000 Domain with an Exchange 2003 server already in the environment?
Anser to this is yes, there may be issues. Better you try it first in test environment if time permits or be ready for more troubleshooting to fix things.
JohnLoAuthor Commented:
What issue may arise?
JohnLoAuthor Commented:
I can not put it in a test situation currently.
Lee W, MVPTechnology and Business Process AdvisorCommented:
There SHOULD be no issues.  There was a problem with Mangled attributes if you used Exchange 2000, but 2003 should be good.  That said, you SHOULD be doing a test or two and ABSOLUTELY make a FULL BACKUP of both system's C: drives before proceeding.  Virtual Machines and Technet offer an inexpensive and flexible way to create a test network.  I strongly recommend you do it.

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JohnLoAuthor Commented:
Yes everything is Veeam backup and BUE nightly so there is issue with backup.
Just wanted to make sure there were no steps missing!
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