Microsoft says telemetry helps improve user experience and fix potential issues. Why? The default-enabled Windows 10 telemetry feature set periodically sends usage and performance data to select Microsoft IP addresses. The telemetry service in Windows 10 particularly irks security-minded IT pros. 9, 2018) – While the overall reception to Windows 10 has been mostly positive, more than a few IT administrators remain wary of potential privacy and security issues.