"Your" vs "My" in user interfaces

(edited 11-12-2017 after comments below) MS Windows User Experience Interaction Guidelines suggests the following: “Use the second person (you, your) to tell users what to do.” So use second person for error messages, help, window or page labels, on-page documentation, and other places where the app is telling the user about the user’s content. “Use the first person (I, me, my) to let users tell t