Finally, I give Nadella an A+ for this Build announcement: Microsoft will bring back the Start menu in Windows. That's a symbolic move, but it shows a willingness to admit and fix past mistakes, something Ballmer was never very good at.
I also like that Elop is getting such a high position at Microsoft. He had been in the running to succeed Ballmer. Giving a rival a chance to shine shows that Nadella has confidence in his own role.
Of course, another early report card on Nadella's tenure was issued by a higher power than me: Wall Street. Two months after Nadella took the helm, Microsoft's stock was trading at more than $40, up 11% since his accession. I think that's the Wall Street equivalent of straight A's.
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