It creates a virtualized network loopback environment on the PC. It installs a simulated volume-license management endpoint that local programs can query to maintain an "activated" status. Supported Software Matrix

Microsoft Toolkit v2.5.3 is a free and unofficial tool, and users should be aware of potential safety and security risks. Some concerns include:

Utilizing subscription-based models for Office apps, which provide continuous cloud updates, security patches, and cloud storage legally.

The Toolkit installs a small, local service that acts as this server.

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microsoft toolkit v2.5.3