I googled hard to find it once.
Especially as there are so many spoof or downright dangerous programs that claim to help you. And bigger the advertisement, the scarier the result.
Personally I am part of the brigade with gentlemen above, 6 machines later I never looked back. Although I upgraded when I wanted and once I had a reason plus time available to do so. Frustration that MS is getting close up and personal about making that decision on behalf of the user is well understood.