Microsoft's surprising comeback over Apple is the outcome of two new CEOs with radically different gameplans (AAPL, MSFT)

Microsoft briefly overtook Apple this week as the world's most valuable company.
The development speaks volumes about investors' faith in the respective companies' futures and the leaders driving each company there.
While Tim Cook has demonstrated that he's a great manager for Apple, he's repeatedly shown he's "not a product person," and he's left shareholders wondering about the company's next act.
By contrast, Satya Nadella has resolutely directed Microsoft to its next act, and his vision is s