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can someone please elaborate below.<br />
<br />
Exchange 2007 Mail flow<br />
Exchange 2010 Mail flow<br />
Exchange 2013 Mail flow
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can someone please elaborate below.

Exchange 2007 Mail flow
Exchange 2010 Mail flow
Exchange 2013 Mail flow

Exchange Mailflow

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.