Check this out: http://help.msn.com/EN_US/HelpWindow_msg.asp?INI=Messengerw10.ini&H_VER= 1.7&SearchTerm=nogol&H_APP=MSN%20Messenger&S_Text=For%20help%20on%20MSN% 20Messenger%2C%20click%20a%20topic%3A&ContactUs=&v4=DH_PREM Look for the ISA Server.