Exchange 2010 - CAS and DNS entry in coexistence with 2003

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?
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liquid101Asked:
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AkhaterCommented:
It will work no issues here. As long as you dont have mailboxes on 2010 you canjust change the dns settings and you are done
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liquid101Author Commented:
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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AkhaterCommented:
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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liquid101Author Commented:
Thanks!
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