Microsoft chief Steve Ballmer to retire
23 August 2013 Last updated at 15:22 BST
Microsoft has announced that chief executive Steve Ballmer will retire within the next 12 months, once it has found a successor.
Mr Ballmer is currently overseeing the transformation of Microsoft into a devices and services company.
He said in a statement: "There is never a perfect time for this type of transition, but now is the right time."
Business Correspondent Mariko Oi said Microsoft had been criticised under Mr Ballmer's leadership.