Multihomed VPN server

Hi,

I am trying to configure a new adapter to accept incoming VPN connections on a server 2003 box. It seems the recommendation is to leave the gateway off of the LAN adapter, but configure it on the WAN. Well we have no WAN, just a small business network of 15 workstations with this server running exchange and a web page. If I remove the gateway from the original LAN connection and add it to the new VPN adapter, internet connectivity is lost along with our web page.

I have also looked at static routes, but I was not sure what to do with them. The main problem is correctly configuring the two adapters for our needed use.

Thanks in advance for replying