Relatively laid back and conversational for a high-profile company like Microsoft. They will fly you out to one of 4 locations (Redmond, Charlotte, Dallas, or Fargo) for a pre-event dinner the night before at a nice steakhouse. The food was great, but unfortunately you spend most of your time getting to know the other candidates and Microsoft employees so there isn't too much time to enjoy the buffet style food. This was very helpful and eased my nerves as everyone at Microsoft was friendly and easy to speak with. Left dinner around 9, went back to hotel to glance over my resume one last time and get a full night sleep before needing to be at the office for 4 hours of interviews at 7:30 the next morning. You are interviewing for the Support Engineer OR Premier Field Engineer role, and it is my understanding that Microsoft will determine which role you would be a better fit for and extend you an offer for that role. From my understanding, the main difference is that Support Engineers need more technical depth while PFE's need more technical breadth and spend the majority of their working hours traveling and visiting customers on site. As for the interview - Microsoft is genuinely interested in finding out if you will be a good fit for the company, so relax and be yourself. The 3 month MACH training program all PFE and SE new hires go through is apparently pretty tech-intensive and very thorough, so the interview seemed to be less technical and more behavioral as Microsoft believes it can teach any intelligent, driven individual how to succeed in the role.