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richtree

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Is Exchange 2010 Edge Transport role required?

I plan to upgrade my Exchange 2003 to 2010. I have only single Exchange 2003 server. When I read through the Exchange 2010 documentation, it mentions that CAS, Hub Transport, Mailbox roles can be on the same computer, and Edge Transport role must be outside the domain.
Q#1. Is Edge Transport role required?
Q#2. If Edge Transport role is skipped, what features/advantages are lost?
Q#3. Does my MX record point to Edge Transport server or CAS server?

Thanks.
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richtree

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I am confused. If external mail server connects to Hub server, then when will the Edge server be involed? Can you provide a scenario where Edge is involved and describe how mail flow between those roles?
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Does it means that the MX record points to Edge server, then forward mails to Hub then to Mailbox?
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Thank you.