How does Windows 10 telemetry really work? It's not a state secret. I've gone through the documentation and sorted out the where, when, and why. If you're concerned about private documents accidentally leaving your network, you might want to turn the telemetry setting down.
Telemetry is not a four-letter word.
You wouldn't know that to listen to the relentless hammering of the technology by Windows 10 critics, who see it as a form of "spying" on the part of Microsoft. Unfortunately, many of those critics have used unreliable data , compounded by a misunderstanding of the basic technology, to form their opinions.
In this article, I want to take a closer look at the way that telemetry works and the data it collects. This article relies primarily on my own testing, using a number of Microsoft-provided tools as well as third-party utilities.
My research also included discussions with engineers as well as reviews of some thorough but obscure documentation. The most useful resource I found is a detailed technical paper written for IT pros and published in the TechNet Library: Configure telemetry and other settings in your organization