Note: it now forwards to the default www.microsoft.com page.
Interesting return from "view source" from http://preview.microsoft.com/en/us/default.aspx if anyone cares to look at it. You might want to take a look at the JS files also.
It's not an argument that the site only works with IE. If it's AJAX, it should work with other browsers. I wondering if if I unravel that code, will I think exclusion is intentional?