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As long as you do the adprep then no. You may want to revise your FSMO roles but not essential. My company have server 2008 running alongside 2003 domain controllers with no issues. Just make sure any log in scripts that rely on domain controllers have the new DC added.
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As long as you do the adprep then no. You may want to revise your FSMO roles but not essential. My company have server 2008 running alongside 2003 domain controllers with no issues. Just make sure any log in scripts that rely on domain controllers have the new DC added.

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All three answers were helpful, but last two had added detail.<br />
<br />
Thanks for the help all!
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All three answers were helpful, but last two had added detail.

Thanks for the help all!

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At one of our remote offices, they have a single Win 2003 DC. &nbsp;I wish to add a second DC there (for obvious reasons).<br />
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I'd like to add a Win 2008 R2 DC, but just want to make sure it will cooperate with the existing Win 2003 DC there.<br />
<br />
I know I have to run the Win 2008 ADPrep but once done, if I DCPromo the new Win 2008 server, should I expect any issues?
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At one of our remote offices, they have a single Win 2003 DC.  I wish to add a second DC there (for obvious reasons).

I'd like to add a Win 2008 R2 DC, but just want to make sure it will cooperate with the existing Win 2003 DC there.

I know I have to run the Win 2008 ADPrep but once done, if I DCPromo the new Win 2008 server, should I expect any issues?

Adding Win2008 R2 Domain Controller to existing Win 2003 domain

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.