there is no reason to run Ex 2003 on R2. R2 is like a feature pack, you only install it where a feature that is added or improved in R2 is being used. There are no improvements that help Exchange, so there is no reason to do this.<br>
For exchange server installation issue I think following newsgroup <br>
should be more approprate: <br>
<br>
<br>
microsoft.public.exchange.setup <br>
<br>
<br>