He's underrated in the sense that a lot of CEOs of his era completely destroyed their companies, see Intel, GE, GM, Yahoo, etc and he didn't. So that's already a win, he set up the company in a decent position so that when someone with more vision takes over they'll have something to work with, even if he didn't have the talent to pull things off himself. He had a couple of wins (Azure, Office 365) along with many many losses, and they're good enough to secure him a 6/10 on my ratings.
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