I had an on-campus screen and didn't feel that I performed very well, especially with the behavioral questions. Nevertheless, I got an email inviting me to interview in Redmond, WA. The day of the interview, I was nervous, but excited and enthused. My optimism and cheer carried me throughout the day. Everyone I met was so nice and genuine, and declined all phone calls and texts to give me their full attention. One of my interviewers gave me a hard time for not understanding his instructions for testing an algorithm I wrote, but I kept a smile on my face, took his criticism, and ended up giving my own good insight on the solution. I solved every problem during the day, although I didn't always get the best solution the first time. I was very thorough in my testing of each algorithm.
I was very excited to find out that I would be getting a 4th interview, which was with a manager. The function I had to code during this 4th interview was fairly straightforward. It was also easy to test.
Regarding the culture, as I said, everyone was very genuine and attentive. These were all people I would be excited to work with, and I had some pretty good banter with most of them. I got the affirmative interview results soon after. I had a great time in Seattle, and Microsoft of course paid all the expenses.