Well I learned from the Entourage google group that Entoruage supports
WebDAV connections which is how I am able to use Entourage to access
the server with just my OWA address.

So far it seems that Outlook does not support WebDAV so I may be out of
luck. I will be working wiht my IT folks to find an outlook solution
that likely will involve a VPN connection or RPC over HTTP. If you have
any other suggestions for utilizing the WebDAV connection, I am all
ears.