I have a mixed domain XP, W7, server 03 and 08. My W7 desktops have stopped being able to see other computers in "network" and in a net view from cmd line. XP boxes have no issues. I have IPv6 disabled but do have netbios over tcpip enabled from the DHCP server. I have a WINNS server as well. Users can access resources via URL from shortcuts or run line, can ping, FW disabled network discovery and IO mapper are enabled.