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Microsoft Internet Security and Acceleration (ISA) Server 2004 is the advanced application-layer firewall, virtual private network (VPN), and Web cache solution that enables customers to easily maximize existing IT investments by improving network security and performance. ISA Server 2004 contains a full-featured, application-layer-aware firewall that helps protect organizations of all sizes from attack by both external and internal threats. ISA Server 2004 performs deep inspection of Internet protocols such as Hypertext Transfer Protocol (HTTP), which enables it to detect many threats that traditional firewalls cannot detect. The integrated firewall and VPN architecture of ISA Server support stateful filtering and inspection of all VPN traffic. The firewall also provides VPN client inspection for Microsoft Windows Server 2003-based quarantine solutions, helping to protect networks from attacks that enter through a VPN connection. In addition, a friendly user interface, wizards, templates, and a host of management tools help administrators avoid common security configuration errors.