Hi Chaps, We're lucky enough to be on an academic network that has offered us an entire subnet of public IP's. Our setup consists of about 25 desktops, and four servers. I'm agonising whether or not to put the entire network within a Private subnet. My gut says yes as it makes it much easier to hide everything behind our ISA firewall and just publish OWA/RPC over HTTP/SMTP. But I'm wondering, is this possible or even advisable on network that consists entirely of public IP's? I suppose it would require the ISA Firewall to also act as a router. Apologies for any misuse of terminology. Note that our vlan isn't totally exposed to the internet, the University provide basic protection. Though we're meaning to improve this using ISA 2004. Your insight is appreciated, Cheers, Jason