I handed in my resume through school's career fair. Then MS contacted me very soon. An on-campus interview was arranged in the next week. The problems are not that hard. First is some questions about your resume. Then algorithm. But you should be well prepared for some classic algorithms and basic programming language knowledge. Due to the agreement, I can not tell too detailed about the question. But It's a very famous string algorithm. Due to my limited knowledge and the rush in preperation, I didn't get the offer.