In an email to employees on Tuesday, he said, Today is a very humbling day for me. It reminds me of my very first day at Microsoft, 22 years ago. Like you, I had a choice about where to come to work. I came here because I believed Microsoft was the best company in the world. I saw then how clearly we empower people to do magical things with our creations and ultimately make the world a better place. I knew there was no better company to join if I wanted to make a difference. This is the very same inspiration that continues to drive me today. Ive been fortunate to work closely with both Bill (Gates) and Steve (Ballmer) in my different roles at Microsoft, and as I step in as CEO, Ive asked Bill to devote additional time to the company, focused on technology and products.