Steve Jobs Resigns
08/24/2011 AT 07:30 PM EDT
His letter to the board and employees did not mention his health problems, but it was alluded to.
"I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple's CEO, I would be the first to let you know," he wrote. "Unfortunately, that day has come." (For the full letter – sent to Apple's board and later released publicly – see Fortune.com.)
Jobs, who took medical leave in January, will remain on as chairman and former Chief Operating Officer Tim Cook will take over as CEO.