On-campus interview in November. Couple questions about why Microsoft and why SDE. One coding question, be sure to think of end cases and when you might possibly overflow. Heard back in a week that they wanted to bring me on campus for an interview, but that it would take some time because they were completely booked. Flew to Seattle in late January. I had already received an offer elsewhere and tried to expedite the process as much as possible. Met with a recruiter at 10am, then 4 back-to-back interviews about coding, open ended design, and a behavioral with the hiring manager. Finally left the campus at 6pm. The recruiter said she'd call me with my results within one to two days. Called me on the second day, no offer.

1 Phone Round that was 30 mins where I was asked a mix of technical and behavioral questions. 2 back to back 45 minute interviews each with 1 coding question.