When you hit a 404 error page on IIS.net (for example a broken link on one of your pages) the search box doesn't work as it result in a malformed URl.
Here is what I did.
http://blogs.iis.net/chrisad/archive/2007/01/03/managing-iis-6-0-servers-from-windows-vista-and-other-management-stuff.aspx
And I get redirected to the IIS Page not found screen
http://www.iis.net/error-notfound.aspx?aspxerrorpath=/default.aspx
Tried to follow the useful information of "Use the search box to locate helpful information."
Upon entering info to the search box you are redirected to a broken URL there is an have additional http// in the resulting URL
http://http//www.iis.net/search.aspx?q=iis