147 Chapter Five Smartphones Mobiles and Microsoft Pieter Knook started working at Microsoft in October 1990. Previously he had been running a small business in the UK offering local area networking to let PCs (running MS-DOS; Windows 3.0 had only just been introduced, and wasn't yet widely used) connect to each other. The business grew, and was sold: `I then had the choice of staying but I was attracted to Microsoft because of its crazily audacious goal at the time to put a PC on