Outlook Web Access through VPN

I`ve got a ZyXEL ZyNOS V3.52(WA.3) Router. Behind it I have a Windows 2000 server with Exchange 2000 server installed. The server`s IP is (Gateway address for the server is: ) The same IP I use when I want to configure the router. The WAN settings on the router is: My WAN IP address a.a.a.a(senseored) and My WAN Gateway Address is b.b.b.b. Let`s assume that I want to access this My exchange mailbox through OWA from my homecomputer`s WAN IP ( far as I know the Outlook Web Access should have been properly configured for External access. If  You have Thorough knowledge of configuring the ZyXEL router (Through VPN) and OWA for for external access I`d appreciate som detailed advice`s. Althoug I said that the OWA should have been properly configured for external access, ther may be some wrong settings so if there`s some issues that you think is relevant to this tell me. Accessing the Exchange server through OWA from an internal network address works fine.
Also: How should I set up my homecomputer to receive mail from the exchange server?
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most vpn capable routers have some form of wizard to export the settings in to a compatible client software package

VPN will allow access as though you were internal ( so the external config worries aren't really worries at all )

To get your exchange mail at home should only happen a couple of ways:
One: via OWA - your firewall will need to map port 80 to your exchange server
TWO: via VPN - once you have VPN'd to your network, you should be able to check exchange mail like you do at the office.
Three: via POP3 - you then have to have your firewall map port 110 to your exchange server.  

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