The policy controls the state of the Application Telemetry engine in the system.
Application Telemetry is a mechanism that tracks anonymous usage of specific Windows system components by applications.
Turning Application Telemetry off by selecting "enable" will stop the collection of usage data.
If the customer Experience Improvement program is turned off, Application Telemetry will be turned off regardless of how this policy is set.
Disabling telemetry will take effect on any newly launched applications. To ensure that telemetry collection has stopped for all applications, please reboot your machine.