Steve Ballmer will continue to be Microsoft’s CEO for a maximum of 12 more months, but no reasons for his departure are known right now.

Of course, analysts around the world rushed to speculate on Ballmer’s retirement, while sources familiar with the matter claim that Ballmer was pushed out of the company by new investor ValueAct Capital.

Australian media mogul Rupert Murdoch said in a short tweet posted yesterday that Microsoft’s board is partly responsible for Ballmer’s retirement, claiming that the transition to a new CEO is “fascinating.”

“Microsoft change fascinating,” Murdoch wrote. “Big hedge funds at least partly responsible. Successor needs to get back in front of tech world,” he continued.

Ballmer, on the other hand, denied reports claiming that he was forced to leave, but at the same time, he refused to provide any other details for his sudden decision to retire.