I had a client call me panicky saying his site was down after an update / move. I checked the site via the url and it was fine. A couple of days later he insisted that it was still down. Turns out he wasn't putting in the url of his site but keywords into the address bar of his browser(exploder) and this was taking him to "Live" search results. Which he clicked on to enter his site. During the update we had deleted some files on the site as per his request. However, those were the files that were coming up in his search that he used to find his site.