Dear all This may sound very basic but i am new to ISA Server (first day today) but already have a nightmare problem on my hands.....Peharps i should have stayed at home and rested on my sunday...should not have come to the office today!!! The problem I have just installed ISA Server on my Exchange Server, my clients are no longer able to send or receive emails. My Norton Antivirus is also unable to update. The only application running on my mail server is Exchange 2000. I need a basic step by step guide of what to do. Can any one help?????? Thanks JT