How To Deploy OWA 2007

We are researching configuration options for OWA 2007.
We currently have a Sonicwall Pro 2040 configured with restricted port 25 access for our email.
What would be the preferred way to configure OWA 2007?
Do we need to create a DMZ? Should we be implementing Forefront TMG? What would be the best configuration for TMG if we did deploy?
Sorry to be vague, but we are open to any advice.
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OWA 2007 utilizes ports 80 and 443.  If you have an SSL cert for OWA you'll only need to open port 443.  You shouldn't need to make any other changes.

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for OWA 2007 you will only need to open port 443 on your firewall and map it to your Exchange server nothing more.

You do NOT need a DMZ in that case.

If you can afford to add a TMG/ISA you will be adding an additional layer of security since ISA/TMG will reverse proxy the requests to your exchange server and no external connection will be made directly with exchange however look at it as a luxury
Set up an ISA with 2 nics.(internal and external interfaces) Import the SSL certificates, set up an OWA publishing rule. For username/password authentication after that point, it is fairly simple. If your users have smart cards, authentication may get more involved if you choose KCD for authentication.
thanks for the points!
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Microsoft Forefront ISA Server

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