When Tim Cook took the stage yesterday, he was out for blood. One of his most vicious attacks came in the form of an OS market share comparison, in which he noted that while Mavericks had already been installed on more than half of OS X computers, Windows 8 was still struggling to top 15%. There’s no doubt that Microsoft is struggling to convince users to migrate, but the latest data from Net Applications has a silver lining: Windows 8.1 has finally attained a higher market share than Windows 8. As The Next Web points out, it has taken Windows 8.1 seven months to overtake its predecessor, which has all but stalled out in terms of growth. In fact, Windows 8