Former Windows Head Sinofsky Joins Box as Adviser - Digits - WSJ

Evidently Box didn't make the "certain competitor" list in Sinofsky's final non-compete agreement

"In his more than 20 years at Microsoft, Sinofsky worked on some of the company’s biggest products, including Windows and Office. He was also involved with the online-storage service SkyDrive, which competes in a growing space that includes Box, DropBox and Google Drive.
Sinofsky now brings that document-management experience to Box, which focuses on the workplace. “I’m excited to work Aaron and team to lend my experience to furthering the Box vision of the enterprise,” Sinofsky said."

Former Windows Head Sinofsky Joins Box as Adviser - Digits - WSJ