Microsoft Software Development Engineer interview questions

Got the interview from speaking with an engineer at a university career fair. During the interview, I was asked about my undergraduate courses. He asked what my favorite class was. I've heard from other students that they've also been asked the same question. The interviewer went over the different available positions they were hiring for, and he went through a quick form about which positions I would be interested in. After some general background and interest questions, he asked me to solve a coding problem on a white board. I personally found the setup pretty intimidating with the interviewer staring at the back of my head, but the question wasn't too bad. The question was as follows: Given two strings, how would you remove from the first string all the characters which appear in the second string. I thought I did decently well and the interviewer seemed satisfied. Overall, the interview was so-so, but not extraordinary.