Elop isn't with Microsoft, he's just the typical type of person who makes it up the corporate ladder - narrow minded, incapable of seeing past their biases, and generally not very intelligent. (Not necessarily stupud, just not that smart either.) He went with Windows Phone 7 because deep down inside that's what his brain knows and understands.

And he dropped MeeGo because he blamed the slowness in development of that on it being MeeGo and made in-house, not on flaws of the internal beaurocracy, where that blame probably lay (given that Harmattan MeeGo didn't take too long to pop out of Nokia's woodwork shortly after all the layoff sprees). Again something people do when they are face with things that aren't part of their status quo - when people see problems in something they know/understand/approve-of they blame the circumstances/people involved, when they see problems in something they don't know/understand/approve-of, they blame the something in question.

But as much as I don't like to defend Elop, the Kin is an unjust criticism - the Kin was largely strangled from within by Microsoft coorporate politics by the guy who headed the more main-line Window Mobile division, based on what I've read.