How do I connect someone's Iphone to a corporate Exchange server using IMAP?

I have a user in my office that just purchased an Iphone and would like to be able to access his e-mail from anywhere over the EDGE network.  My Exchange Server is running the IMAP4 service.  What steps do I need to take to get the user to be able to connect using IMAP?  How do I know the name of my IMAP outgoing and incomming mail server?  Do I need to do any further configuration on the server?
ericcozAsked:
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cstosgaleConnect With a Mentor Commented:
You need to allow tcp port 143 through your firewall to the exchange server. i.e the exchange server needs to be listening on that port on a public IP address. Usually this would be the same IP you use to receive mail. This usually already has a dns name associated with it such as mail.company.com and this is what you would use for the incoming mail server. for outgoing mail you will need to use smtp, and I would recommend using the phone service provider's smtp server, details you can get from them.
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Computer101Commented:
Forced accept.

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