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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.
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And best to remember, if you're actually using a mailbox that's a mbox single file, large mbox files can easily become corrupt + if they do, then recovery may be very time consuming.
Best to only use IMAP servers for large amounts of mail, so each message lives in it's own file.