Hi all On this week I have to configure a network based on ISA and Exchange. Isa act as a normal firewall and trought this must pass all multimedia data of Netmeeting and MSN. In this Topology, a normal web navigator using ISDN or DSL must connect with MSN Messenger to a server on the internal side the LAN Examples: WEB ---> ISA ---> Exchange MSN ---> ISA ---> Exchange Netmeeting ---> ISA ---> Conferencing trought MSN The question is: is totally possible sharing all of these services with ISA or I must install Exchange on ISA? All yours reply will be useful TIA Giovanni R. (IT)