It happened with Apple in general too - almost overnight, every seemed to ditch their windows machines and replace them with macbook pros.

In part, that was because of things like ios, where a mac was mandatory. In part it was because of things like Ruby which was simply much easier on a mac and in part it was because having a "real" unix shell is so damn useful.

Ruby is (or was?) almost impossible on Windows because everybody was using it for Rails on Linux servers. Running all the related services on Windows is just too hard. I used to have a Linux VM in my XP laptop, then I formatted it to Ubuntu with a XP VM.