Does anybody know how I could use ISA Server to restrict the use of MSN Messenger to certain users/groups? I want some users to be able to use it and others not. I have seen various discussions about how to disable/uninstall MSN but I want to have it available to just selected users. Watching MSN sessions through ISA I see that the username is anonymous. How can I get MSN to authenticate to ISA correctly? My client machines are Win2000 and WinXPPro with the firewall client installed. Thanks Peter Herbison