OWA 2007 - What makes my setup secure?

I have been researching the best way to implement OWA on a Exchange 2007 server.
I have decided to put a Mail Transport server in my dmz, and then the CAS and Exchange 2007 on another server in my lan.

What makes this setup secure/safe from attack?
I need to let my boss know what makes me think this setup is safe.
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Pete LongTechnical ConsultantCommented:
Hello gpersand,

Surely you would put an edge transport server in your DMZ that way you only need to expose a small AD subset using ADAM (which is useless to the human eye) and you only have to open a couple of ports to make it work (you set up an Edge subscription on an internal Exchange server to the Edge Transport Server)


gpersandAuthor Commented:
If my DMZ edge transport server is compromised, wont that give full access to the lan?

The best way to implemented OWA ,as per Microsoft, is to publish OWA through ISA 2006.ISA is placed in DMZ with edge server and CAs/HUB remains in LOCAL LAN.

ALL client requests are processed on ISA for OWA and relayed through secured SSL channel to CAS/HUB.

read this article.

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I don't think the Edge is meant to be completely unprotected.  This particular definition of DMZ would likely include a firewall on both sides.  Also, the Edge server is not meant to be a member of your domain.
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