Proper way to publish OWA 2010 to the outside world

Hello, EE. I'm curious: What is the proper way to publish OWA (Exchange 2010) services to the outside world?  I don't want to open ports to a server on the inside network, and I've read that the OWA server needs unrestricted access to Active Directory, potentially complicating firewall rules if I put the OWA server in the DMZ.

So, what's the solution? Reverse proxy?  I'm looking for real world "I've done it this way, and its awesome" solutions.

TIA
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cipher42Asked:
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