Hmm, XP would be my best guess, Windows 2000 tool-wise.
They did move away from user privacy concerns ever since Vista and so Windows 7 really is no different, albeit a little more honed, not to our benefit.
However, as much as we like to keep it simple, there ought to be a formal limit as to how far you are allowed to take it. The individual's RIGHT to privacy is trampled on and 'Opt out' simply does not cut it on the subject. Anything even remotely trampling on our RIGHT to privacy as previously mentioned should be strictly 'opt-in' with a clear short message about what you get and what you give up, written in a language meant to inform.
I think I mostly oppose to the sneakiness of this... please, for our children...