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Just what I was looking for. Thanks
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Current servers in place.<br />
2003 DC (holding all roles) &nbsp;and 2008 R2 DCs<br />
2008 server running Exchange 2007 version SP3 08.03.0298.003 <br />
Domain and forest level set to 2000 native.<br />
I need to retire the 2003 DC but when I do will I have any issues with Exchange? (roles will be moved to 2008 DC).<br />
I’d also like to upgrade my domain and forest levels to 2008 once I get rid 2003 server. &nbsp;Will this be an issue with Exchange 2007?<br />
Any information to help with this upgrade would be appreciated.
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Current servers in place.
2003 DC (holding all roles)  and 2008 R2 DCs
2008 server running Exchange 2007 version SP3 08.03.0298.003 
Domain and forest level set to 2000 native.
I need to retire the 2003 DC but when I do will I have any issues with Exchange? (roles will be moved to 2008 DC).
I’d also like to upgrade my domain and forest levels to 2008 once I get rid 2003 server.  Will this be an issue with Exchange 2007?
Any information to help with this upgrade would be appreciated.

Domain Controller upgrade

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

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.