Domain Controller upgrade

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.
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John KovackAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
Exchange will be fine running with 2008 R2 domain controllers; supported to 2012 functional levels.

Exchange Server Supportability Matrix
http://technet.microsoft.com/en-us/library/ff728623(v=exchg.150).aspx
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John KovackAuthor Commented:
Just what I was looking for. Thanks
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