Exchange 2003 to 2010 transition question with single Exchange 2003 server

Hi,
We have one Internet-facing Exchange 2003 server. This is the only Exchange server in the organization. We are planning on upgrading to Exchange 2010. I reviewed the Microsoft paper "Planning Roadmap for Upgrade and Coexistence: Exchange 2010 SP1"
http://technet.microsoft.com/en-us/library/aa998186.aspx
The document states:
"Important:  
   When upgrading an Exchange 2003 organization, an Exchange 2003 front-end server is required to support the upgrade. For each Exchange 2010 Client Access server, you can only configure one Outlook Web Access 2003 URL for redirection. You can accomplish this with a single Exchange 2003 front-end server or a load-balanced array of Exchange 2003 front-end servers. "
Altough our Exchange 2003 server hosts OWA, it is not configured as a front-end server. My questions are:
Does the Microsoft statement mean we cannot have a coexistence environment?
Do you know of a technical paper that would address an Exchange transition in this situation?
Thank you,
PL
PascalLavalleeAsked:
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AkhaterConnect With a Mentor Commented:
No you can have a coexistence environment no problems about it

long story short you introduce a 2010 CAS and setup the exchange 2003 url to redirect to your 2003
please read this article of mine it will save me a lot of rewrite

http://www.zerohoursleep.com/2010/01/installing-your-first-exchange-2010-cas-or-the-truth-about-exchange2003url-part-1/
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PascalLavalleeAuthor Commented:
Exactly what I was looking for. Thank you Akhater!
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