I know that Windows XP Home has a limit of 5 inbound connections when networked. This principle is based on peer to peer or P2P. With ALL updates, printers unshared, master browsers configured, guest accounts given permission even if non-existant, null sessions -1, Norton products uninstalled and registry and files cleaned, and every other help I have found tried, I still have occassion times when I cannot get more than 4 computers on at one time. I am left with the following theory. One CPU has Plaxo. This works on a P2P principle like Napster. Could that be creating the 5th connection to the server, 2 from one CPU, since the .pst files that it interfaces with reside on the server?