Running Windows Server 2003 Standard x64 edition. All clients on domain able to ping each other and view shared folders/printers. However, one client has disappeared from Network Neighborhood. It was visible for a while but then disappeared. If it's address is typed into the address bar, its shared folders show up and its shared printers can be used. It can be pinged also. However, it just doesn't show up in Network Neighborhood?? Why would this happen.