Typically, security products integrate poorly with each other and with one’s existing IT infrastructure. This lack of synergy in the current infrastructure makes it harder to control, potentially creating gaps and inefficiencies in the security of your network.
Microsoft Forefront integrates security capabilities across the product line, with Microsoft server applications, and with your existing IT infrastructure, so that you can achieve greater efficiency and control over the security of your network
For more information about Forefront and how the ISA firewall participates in the Forefront security infrastructure, check out: http://www.microsoft.com/forefront/2006/prodinfo/integrated.mspx
HTH,
Tom