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I believe you just use setup.exe from Exchange 2010 RTM to upgrade your forest and domains.<br />
You might also want to look into running <br />
<br />
setup /preparelegacyexchangevers<wbr />ions <br />
<br />
since you are upgrading from exchange 2003.<br />
Some more info on that here : <a href="http://technet.microsoft.com/en-us/library/aa997914.aspx" rel="ugc">http://technet.microsoft.com/en-us/library/aa997914.aspx</a><br />
<br />
<br />

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We have exchange 2003 in our environment. &nbsp;we have a parent domain and 3 child domains. &nbsp;The the childs have exchange 2003. &nbsp;Since SP1 is out how do we prepare our Forest/domains for exchange 2010 SP1. &nbsp;Talking about the setup/prepapreschema, prepareAD, preparedomain. &nbsp;Should run from Exchange 2010 RTM or can run these command lines from the Exchange2010-SP1-x64.exe. &nbsp;Also is this the right process for the commands.<br />
<br />
run<br />
setup /prepareschema<br />
then run<br />
setup/prepareAD<br />
then run<br />
setup/preparedomain
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We have exchange 2003 in our environment.  we have a parent domain and 3 child domains.  The the childs have exchange 2003.  Since SP1 is out how do we prepare our Forest/domains for exchange 2010 SP1.  Talking about the setup/prepapreschema, prepareAD, preparedomain.  Should run from Exchange 2010 RTM or can run these command lines from the Exchange2010-SP1-x64.exe.  Also is this the right process for the commands.

run
setup /prepareschema
then run
setup/prepareAD
then run
setup/preparedomain

I believe you just use setup.exe from Exchange 2010 RTM to upgrade your forest and domains.
You might also want to look into running 

setup /preparelegacyexchangeversions 

since you are upgrading from exchange 2003.
Some more info on that here : http://technet.microsoft.com/en-us/library/aa997914.aspx




Exchange 2010 SP1

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.