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I haven't figured out what to do with Remote Web Access-- when I try to set it up, the wizard tries to set up the router but chokes (say UPnP not enabled, but in the router setup screen it is enabled). Also, to use it, I guess I need some kind of web site, and the wizard sends me to GoDaddy to register and do a bunch of stuff. What will that get me?

Did you watch the video? The UPnP just tries to tap into the router to open the port (443) automatically. This only works on their approved routers list. You can open it by yourself using portforward.com to find instructions for your router. You don't need to use GoDaddy with SBS Essentials. They give a free domain name (domain.remotewebacess.com) and SSL certificate. You just have to select the option for it. ("Get a personalized domain name from Microsoft") Just sign in with a hotmail account/Live account. It will do the rest. You do not need to buy a domain name.

The whole UPnP thing was to make it easier for people who don't know how to open ports. But you need to have one of their approved routers. There's a list on their site. Again opening a port is pretty simple.

The site will basically show what Bert posted above in the screen shot. A easy way to access all of your remote computers from one area.