Which is surely about as much as we know about win 7, 8, 8.1 anyway.
The one in particular I'm talking about was most likely added in to win 7, 8 and 8.1 through optional updates that can be easily uninstalled (Some updates have added in win10 data sharing, you can look up some of the update numbers online).
I've come to this conclusion because the only mention of it is in Microsoft's Privacy Policy (
https://www.microsoft.com/en-us/privacystatement/default.aspx under "Reasons we share data"), and it was only added in in 2015 (according to the wayback machine) when the windows 10 previews came out, meaning most likely they added it in because it's coded into windows 10 by default.
There's also no mention of it being something optional, in fact quite the contrary. If you look at the privacy policy on their mobile site you see the same passage with the text "Mandatory disclosures."
If you're worried about windows 7, 8 and 8.1 having an at-the-time illegal backdoor in it, then you shouldn't have been using any windows in the first place. According to those theories Windows has been backdoored since '95.