Use this tool to help you understand the potential benefits of deploying the 2004 ISA firewall instead of upgrading network bandwidth. ISA 2004 offers a financially appealing alternative to bandwidth upgrades, and the benefits are gained in a number of scenarios. You can see significant cost savings when the ISA firewall is configured as a branch office network firewall, or branch office VPN server, or even when the ISA firewall is configured as a unihomed Web proxy only Web proxy and caching server.
This calculator quantifies these benefits along with potential savings from increased user productivity.
Note that you must have macros enabled in Excel to run this calculator.
Download the ISA firewall cache savings calculator at: http://www.microsoft.com/isaserver/solutions/branchoffice-calculator.mspx
Thomas W Shinder, M.D.
MVP -- ISA Firewalls