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ChazNTroyFlag for United States of America

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Migrating to Exchange 2010 in Mixed 2k3/2k8 (Exchange 6.5.7638.1)

I'm migrating to a new Exchange 2010 server. I've built a 2k8 R2 box and ready to push the "install" button - BUT...

Readiness checks passed 6 out of 6. Under organiztion prerequisites, I get the warning: "Setup is going to prepare the organization for Exchange 2010 bu using 'Setup /PrepareAD'. No Exchange 2007 server roles have been detected in the topology. After this operation, you will not be able to install any Exchange 2003 or Exchange 2007 servers."

Current EX server is a 2003R2(SP2) server - Exchange 6.5 in native mode.
I have one 2003R2(SP2) domain controller and a backup DC on 2k8-R2(SP1, 64bit OS).
Domain/Forrest are already at 2K3 levels.

I already have the article "Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008R2" and continue to study this very helpful post.

Question:
1. Will my current DC's have any functionality affected when I install EX-2010?
2. I'm OK with not having the ability to install any NEW 2k3/2k7 Exchange servers but how will this affect existing 2k3 servers not running Exchange?
3. Will I be able to test email accounts leisurely or do I need to migrate all users once I get the 2010 box up and going?

Basic question is will 2010 Exchange play nicely with the older 2k3 box and treat it with the elderly respect it needs before it goes to the old email server retirement home?
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Stelian Stan
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Great solution - quick answer! Thanks for the additional links.