Bill Gates is a thief and plagiator. Now he see Bitcoin works so he sure have plan to use similar technology just centralised and under his controll. He copied most of his projects so i am not suprised he now want to copy Bitcoin.
He wants to pull a Xerox and create a closed source currency and market it like he did with Windows.
We could see a MicrosoftCoin soon, but you don't get to own the coins, you pay for a license to use them. What would the equivalent of a BSOD be for a cryptocoin, because we can probably expect plenty? If Apple's already launching stuff you can bet Microsoft won't be far behind.