Dear All I am installing exchange 2000 server for mailing and Chating. My Comany is having offices in three Locations and exchange server is installed in corporate office havinng IP 10.1.1.41 . In corporate office we are able to use chat and mailing but from branch office when we try to use it mailing is working fine but we are not able to connect chat server. branch offices and corportae office are in different ip range corportae office is in network 10.1.1.0 Branch office is in network 10.1.10.0 IWANT TO USE MSN CHAT FOR EXCHANGE FROM BRANCH OFFICE TO CORPORTAE OFFICE. PLEASE HELP THANX PANKAJ SRIVASTAVA MIRZA TANNERS LTD. NEW DELHI