Re: I can see Ballmer now...
Whilst surpassing Vista might seem a joke statement given that Vista was viewed as being doomed, the point is the timeframe - Vista was around for over 2.5 years, compared to barely 8 months for Windows 8. Whilst Windows 7 may be a lot higher, that was around for 3 years. (And reports have suggested that Windows 8's uptake rate is on par with Windows 7 - and that was with 7 following on from Vista, which you'd think people were keen to upgrade from or skip over from XP; 8 has no such "advantage".)
OS X may be doing better, but that's every version of OS X compared to 8 months of Windows 8. The most recent version, 10.8, has only 3.14% share, despite released almost a year ago.
In some sense, this really shouldn't be surprising. Given we already know that Windows is the 90% dominant OS, you'd expect there to be lots of software for it, even for just the Windows 8 only stuff. And you'd expect it to do well.
But that's not what people claimed. People, the media, insisted Windows 8 would be a flop. It would be a failure - not just in relative terms, but absolute terms. PCs were dead, they said. Ipads and Chromebooks were the future. Even after the initial sales reports appeared, they still insisted it was a flop. "Those are just licences sold, doesn't mean people are using it" they claimed.
Now we have stats based on usage rather than licences sold, and I bet people will still stick their head in the sand and claim it was a flop. And when Apple next release a product that takes 76 days to sell a million, it'll be hailed as a runaway success...