Exchange 2003 to 2010 Migration Question

Ok I have a strange one here -

Doing a migration to Exchange 2010 from 2003, the client is running their 2003 server wide open no SSL or certs. They don’t want to go though the hassle of configuring it for SSL because it is going way and they are worried about the impact on their mobile users, they are 7 by 24 operation.  
So I talked to MS about some options and here is what they are saying will work. However, I am somewhat skeptical so I just wanted to see if anyone else has encountered this……

MS says If we take the legacy url and point to it to exchange 2003 for all the web services, OA, AS, OWA that the 2003 Exchange users use and just let it run that way with no SSL.  Then do the cutover for mail flow and other web servers to 2010 (still creating the legacy uirl on Exchange 2010). Users AS (active sync) and OA will still automatically still get updated though auto discovery when there MB is moved from 2003 to 2010. Anyone ever see it work this way when the url for the users with MB’s on 2003 was not pointing to the exchange 2010.

Thanks
BPilot67Asked:
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AkhaterConnect With a Mentor Commented:
1) the legacy url exists only for OWA, not for any other service
2) OWA on 2010 can't be done without ssl but you can set the legacy url to http so owa is solved
3) for all the rest the entry point will because 2010 and will need ssl to be configured on the mobile users among others
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BPilot67Author Commented:
Yeah that is what I thought don’t know what this MS guy is talking about. Clarified with him like three times, keep saying it would work. Like a say strange, thanks for the response.
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