Microsoft Privacy Statement - Microsoft collects, uses and discloses personal information as described here. This allows One Drive data, Cortana searches and MS browser history to be sold to third parties.
Cortana and privacy - To personalize your experience and provide the best possible suggestions, Cortana accesses your email and other communications and collects data about your contacts (People), like their title, suffix, first name, last name, middle name, nicknames, and company name. If you call, email, or text someone or they call, email, or text you, Cortana collects that person’s email address or phone number.
