It shouldn't be an issue, but I strongly suggest you test in your lab first.
Otherwise your production environment is just another test lab.
--
Paul Bergson
MVP - Directory Services
MCITP - Enterprise Administrator
MCTS, MCT, MCSE, MCSA, MCP, Security +, BS CSci
2008, Vista, 2003, 2000 (Early Achiever), NT4
Microsoft's Thrive IT Pro of the Month - June 2009
http://www.pbbergs.com
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"ALL" <> wrote in message
news:136828CC-795A-4469-94F1-...
> We are planning to upgrade our AD schema to the 2008 R2 version (we are
> currently on the 2008 version), all our DC's are 2003 and we are at 2003
> domain and forest functional level.
>
> Will this have any problems with exchange 2003 or our last remaining NT
> server (once the NT server has gone we plan to upgrade all our DC's from
> 2003
> to 2008).
>