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Exchange 2003 to 2010 Migration Questions

I am getting ready to migrated 2003 to 2010 Exchange and I have a few basic questions.
•      Once I add the new Exchange 2010 Server (without any mailboxes being migrated yet), which server should incoming     email point to?
•      How will existing Outlook clients get directed or pointed to the new server?
•      How can “owa.company.com/active-sync devices” continue to operate after a mailbox is migrated? Does this mean I have to migrate everyone at once, then repoint the address translation to the new server?

Thank you!
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I have purchased a guide, and there is plenty of information on the Internet I realize, but I was hoping that someone who understands the process, could give me a couple quick answers on how the process would work in a migration scenario (based on the questions I am asking of course).
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So by "gets proxied", does that mean that communications are handled by the Exchange servers over the connector that is setup between the 2 servers, and it is transparent (or does not matter) to the Oulook client  where the mailbox resides?
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ok, so when the legacy server is finally removed, the existing Outlook clients will repoint themselves to the new 2010 server through Autodiscovery I assume? (in which case will need to be properly configured or email will stop working?)
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Thanks a lot guys,  2 last questions if you don't mind:
So bringing up a new Exchange 2010 Server into the environment should not interfere with the current mail flow? I have read that the autodiscover feature of 2010 could cause problems? (this is my main concern, I can always work with test accounts from this point).
Secondly, any advice if my database is currently 200 GB?
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Is AutoDiscover necessary for 2010 functionality? I am asking because I was thinking of adding the certs, dns, records, etc. after I have it up and going.

Since my database is 200 GB right now, I should definitely divide it into a few 150GB databases I am assuming?
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Guys, thanks for all your excellent suggestions. This helps me to understand what I'm reading.