Ternus will take over running the technology giant in September as Cook steps up to become executive chairman.
Microsoft has apologised for the issue, which it said was due to a technical failure.
Experts say the event is a "stark reminder" of how heavily the world relies on a small group of big tech providers.
Microsoft says it is continuing to restore services including Outlook and Teams following a global outage.
Tech firm says it is ‘deeply sorry’ for disruption that took services down and has now addressed the underlying issueWha...
From city governments in the US to spy agencies in Australia, the Microsoft outage is being felt around the world.
Problem affects businesses, government agencies and even tech firm’s own employeesMicrosoft scrambles to fix global outa...
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