Levchin: It was actually sort of a side effect. We had this merger with a company called X.com. It was a bit of a tough merger because the companies were really competitive—we were two large competitors in the same market. For a while, Peter took some time off. The guy who ran X.com became the CEO, and I remained the CTO. He was really into Windows, and I was really into Unix. So there was this bad blood for a while between the engineering teams. He was convinced that Windows was where it's at and that we have to switch to Windows, but the platform that we used was, I thought, built really well and I wanted to keep it. I wanted to stay on Unix.