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With the introduction of Proxy Server 1.0, Microsoft made its first foray into two burgeoning new markets: Internet security and accelerated Web access. Although the initial version of Proxy Server provides only basic security features and doesn't support several popular Internet protocols, it quickly gained popularity among Windows NT-centric organizations that needed user-level access control to Internet services, Internet firewall functionality, and accelerated Web access.

ISA 2000 is an application-level firewall with data-aware filtering capabilities as well as IP packet filtering functionality. To accelerate Web access ISA caches both inbound and outbound Web traffic, which means the server could be used to speed outbound Web access or as a front end to Web server farm to help offload traffic. ISA supports the Cache Array Routing Protocol (CARP) so the product can be scaled to fit larger traffic requirements.