The nugget to take away from this exceptional article:

“Is it 33% 23% or more of the installed base? Who knows? But roughly two-thirds of Windows users are going to have a harder upgrade path later this year than three quarters of Mac users. Are all Mac users going to be happy? No! Of course not! Have you met these people? Bitch, bitch, bitch. All the Macalope’s saying is that 65% of Windows users have to move their files off their machines.”