Last 10 years is right - Windows 10 was when they went all-in, and that was released in 2015. Before that, "telemetry" usually referred to situations where the same entity owned both ends of the data collection, so "consent" wasn't even necessary.

Microsoft caught flack for backporting telemetry to Windows 7 in the Windows 8/8.1 era. They really started sucking down data in Windows 10 but their spying started years before that.