I have ISA 2000 Server running on an older PIII 450 Mhz 512MB server with 8 GB space. My current network is 108 PC's covering 5 building connected via slow Frame Relay connections. For Internet access all computers connect to my ISA 2000 server and then pass to a PIX firewall. This is a small network with limited funding. Within 3 months the Frame Relay connections will be removed and replaced with cable modem business class service with VPN's and intergrated firewalls. This is being done to improve data transfer and lower costs. The traaffic flow with continue to pass to a central location and then out my PIX. I'm wondering if I should keep the ISA 2000 server acting as a proxy or retire it. It's only job is to server as a proxy, no firewall , no Internet access restrictions, no contnent filtering. Since no users are restricted from the Internet and no filtering is being done I don't see a great need for the Proxy and am concerened that without hardware upgrades this proxy will start to bottleneck traffic.
What would the benefits be for keeping this ISA 2000 server in opertaion as opposed to just pushing all clients out our PIX?