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Welcome to the product documentation for Microsoft Forefront Threat Management Gateway (TMG). Forefront TMG is the advanced stateful packet and application-layer inspection firewall, virtual private network (VPN), and Web cache solution that enables you to easily maximize existing information technology (IT) investments by improving network security and performance.

This documentation is designed to assist you in understanding Forefront TMG and learning how to deploy and operate the software, and it also provides reference materials and troubleshooting tips.

For the most recent documentation, please see the Forefront TMG TechNet Library.

The documentation is divided into the following general subjects:

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