I was contacted by a Microsoft college recruiter. I initially applied for a Software Development Engineer Intern Position but because I was in my last year of my Master's degree the interviewer told me that I can't apply for an internship position because after the internship I wouldn't be going back to school anymore. So she decided to interview me anyway but consider me for a fulltime position. I wasn't sure if I want to move from my country to the States so I guess this thing was a major black ball for me (I guess). After all the questions were related to the projects I listed on my resume. She asked what was the most technically challenging project I worked for in the past. I didn't review enough my projects because I didn't have enough time and because mostly of them were OS &kernel related and I mostly forgot how I did them and what were the major problems that I had to overcome. So an advice would be to review all the interesting projects that you did in the past in order to answer rapidly and accurately about them. I think this was the major reason that I didn't get an onsite interview (bacause the interviewer couldn't make a clear idea about the projects that I did).