This is something that is not Xolox specific as far as files that do not exist anymore go. It has to do with the way that search results are reported. Some are taken from a list of files and IPs instead of only the files on that one computer. (It really helps get more results and keep network traffic down) If a file is on such a list then it can still be reported as a result. Even though these lists are usually updated quite frequently, dead links can still bet passed on. Also I have the feeling that Xolox simply does not count hoasts that have logged off or refuse connections for any reason other than being busy in any of the catigories in the downloads tab.