Microsoft is careful about what it commits to in public. Its careers page says only that a typical interview is two to four conversations, up to an hour each. It does not publish a fixed loop size, a scoring scale, or a timeline. So this page marks every stage with where the fact comes from: Microsoft-published means it is stated by Microsoft, and candidates commonly report means it is community detail that is consistent but not official.
Two accuracy edges matter here, because secondary sources get them wrong. First, the As Appropriate, or AA, interviewer is a historical, informal term. Microsoft's own engineering blog says it is not officially used any more, though you may still hear old-timers use it. A senior final interviewer still often synthesizes the loop, but presenting AA as a current official stage is incorrect.
Second, Microsoft has no standing hiring committee. This is the load-bearing difference from Google, which uses a hiring committee, and Amazon, which uses a Bar Raiser. At Microsoft the interviewers submit feedback, the team debriefs, and the hiring manager makes the call with the recruiter. Claims of a Microsoft hiring committee are a common secondary-source conflation of that debrief step.
The practical takeaway runs through every stage: your direct interviewers and the hiring manager carry the weight, and the behavioral round reuses the stories your resume implies. So the resume work is to pre-load owned, quantified results that the loop can probe, especially stories that show a growth mindset and accountability.