Microsoft Senior Engineer - Software Development interview questions

Recruiter contacted me via LinkedIn. Setup a phone interview with 3 different groups and 2 groups wanted to bring me on site for a final interview. On-Site Interview with Group # 1: Hiring manager expressed his desire openly to hire me at the end of an interview and he asked to meet the director (he was not on my interview schedule). It was a clear sign that they will extend me an offer based on hiring manager's feedback. But they disappeared completely after an on-site interview. Recruiter did not even bother to email me saying I am rejected. Totally unprofessional behavior after the interview. Group # 2 Hiring manager was totally unprofessional. After each interview with his team members, he asked me to wait outside conference room and checked with the interviewer how I performed. One of the interviewer did not even book a conference room for an interview, instead he walked me over their entire building to find a break room where we can sit and discuss. Eventually he found an open floor white board where tons of ppl walk by every minute and he asked me to write a code on that white board while other ppl walking by looking at what I am doing. Really? I work in Fortune 100 company but never seen this type of unprofessional interview. I totally hate the hiring manager and the group, so I was not expecting to get a positive response from this group. Overall Microsoft has a tendency to interview tons of ppl but that does not necessarily mean they are actively looking to hire someone right away. So don't go with a feeling that you will get an offer if you are prepared. I think I did exceptionally well with Group # 1 (technically, behavior, leadership and management discussions) but they disappeared completely. I had a totally unprofessional on-site interview experience.