Apple's board of directors has tied a massive stock grant given to CEO Tim Cook in 2011 to the company's performance, a move that could cost Cook $135 million over the next nine years at the current share price.Related StoriesMicrosoft reverses policies on Xbox One rentals, online check-ins, and region restrictionsApple rolls out iOS 7 beta to Cupertino locals, OS X Mavericks beta to retail staff
