Microsoft puts you through an interview loop in which you have 1:1 interviews with at least 3 people and up to 6+. You continue through the interview process as the majority of individuals rate you as a hire. If you get 3 no hires right away then typically your loop will end. If you continue to get a majority of hire ratings then you most likely will end the day with an as appropriate interviewer which is typically someone in higher level management for the role you are interviewing for.