[THIN] OT: Exchange - bringing e-mail in-house

Sorry for the OT, but I couldn't think of a better group to steer me in the
right direction.
 
We have Exchange 2003 on Server 2003 with internal e-mail and calendaring,
etc. enabled.
 
The task now is to bring the external e-mail (now hosted by and ISP with our
domain name) in-house.
 
I'm looking for a white paper, tutorial, etc. that will cover all the steps
including routing the public IP to the Exchange server.
 
Thanks in advance for any and all suggestions.
 
Mark

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