Microsoft maintains that Windows 10 doesn't collect the user’s personal data, but rather anonymized data sets that is necessary to improve overall Windows functionality for better user experience.
As Microsoft increasingly embraces SaaS (Software as a Service) may mean more frequent updates to the Windows platform, and it will require such data to understand how people are actually using Windows applications.
With such data used to understand how to prioritize changes to existing Windows components and know exactly what new features are needed.
Albeit, Windows 10 telemetry levels do affect IT administration and security, administrators' can control what is sent back to Microsoft using group policy objects. With the Privacy option that allow administrators choose one of three telemetry levels: Basic, Enhanced, and Full.
And the Security level that sends the least data, available only to admins, which collects only technical data about Windows’s Connected User Experience and Telemetry component settings, the MSRT (Malicious Software Removal Tool), and Windows Defender to keep Windows, Windows Server, and System Center secure.
However, it has one setback: MSRT is disabled as Windows Update is not running, and the update installation processes isn't collected at the Security level.
Therefore, it obviously require lots of IT involvement to keep the systems secure if the telemetry level is set to Security.
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