It works - not sure why, but it works. Here's what I had to do. SBS has static IP of 192.168.2.4. IIS is also on 192.168.2.4. I chose the next open IP (192.168.2.8) for WAMP. Configured the NIC and IIS just like in the link I posted above. Everything worked INSIDE the network but WAMP was not working OUTSIDE. I ended up changing the router port forward for port 80 from 192.168.2.4 to 192.168.2.8.
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