Microsoft Software Engineer Internship interview questions

I got an interview through a friend in the company. Interview was a technical phone screen with a senior engineer. It was my first real technical interview, and it was done over microsoft skype which made the coding itself quite unpleasant.

Applied online and was then invited to an on campus interview. I answered the questions correctly, provided thorough explanations out loud, and gave multiple solutions and analyzed their space and time efficiency . Asked the recruiter about my performance at the end and recruiter told me I answered the questions well, that I had really cool projects, and that my former work experience was a plus. Told me I should expect to hear back soon. Got a generic rejection email a month later without ever moving onto the next round. Like... what ... I'm speechless. I'm very salty about all this .. saltier than a can of Campbell's soup ... so salty I put the ocean to shame. This is why I don't use windows computers anymore.