ESETs expert looks at some concerning privacy issues in the new Windows 10. Windows 10 potentially gives Microsoft access to the same information about your lifestyle that has previously only been accessible to popular smartphone operating systems such as Apple iOS and Google Android. It is easy to imagine situations where an individual might not want to have information about appointments with doctors, lawyers, family planning clinics and so forth parsed by an outside party, even if that outside party is a machine intelligence expert. This data could then be used for various purposes, by various parties, should they gain access to it.”]
Source: https://informationsecuritybuzz.com/articles/privacy-issues-in-the-new-windows-10/