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.
>>userbi+(OP)
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.