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So what does the CAS server do to the Exchange 2003 environment or AD when it installs? &nbsp;Anything? &nbsp;Or does it just setup a &quot;connector&quot; to talk to the 2003 Front-End?
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So what does the CAS server do to the Exchange 2003 environment or AD when it installs?  Anything?  Or does it just setup a "connector" to talk to the 2003 Front-End?

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It doesnt do anything to make it not work, it does register itself in AD but it doesnt affect this part
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It doesnt do anything to make it not work, it does register itself in AD but it doesnt affect this part

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In theory, if CAS somehow doesn't work during the install from 2003 to 2010, can I just repoint the DNS entry back to my legacy 2003 Front End? &nbsp;Will that work or does the install of CAS change more than I'm taking into account?
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In theory, if CAS somehow doesn't work during the install from 2003 to 2010, can I just repoint the DNS entry back to my legacy 2003 Front End?  Will that work or does the install of CAS change more than I'm taking into account?

Exchange 2010 - CAS and DNS entry in coexistence with 2003

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.