How does Activsync work during an Exchange Server Migration

When migrating from Exchange 2003 to 2010 what should I expect from activesync connectivity? I have ports open on the firewall to accommodate Activesync on the Exchange 2003 server. Without changing the firewall should users with mailboxes on the Exchange 2010 server be able to continue to use activesync via the Exchange 2003 as a sort of proxy?
CanOfWormsAsked:
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Simon Butler (Sembee)ConsultantCommented:
If you follow the guidelines for migrations and coexistence between the two versions of Exchange, it is all self explanatory.

You configure a legacy host name for the Exchange 2003 server and point the current live URL at the Exchange 2010 server. Exchange will then redirect or proxy the traffic to the server as required. When their mailbox is moved, nothing needs to be changed on the client.

Simon.
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