I remember one comment at a perf review from my boss when I worked at MS. There were two of us on the team of 35, who were working on a certain tenet. My boss said "next review season, I'm going to go around and ask people who's the [tenet] expert. It should be you, not him."<p>So although we were working together, we were also competing. And yeah, when he asked, I was the expert. I think a large part of that was because whenever the two of us got together to ping people about our tenet, it was in my office, so the emails came from me, and the bug updates were under my name. I did that half-intentionally, and feel a little bad about it.