The Disappearing Windows Advantage

Horace Dediu explains the building and dismantling of the Windows monopoly on operating systems. John Gruber sums it up nicely:

Bottom line: In 1984, DOS PCs outsold the Mac 6-to-1. By 2004, the ratio of Windows PCs to Macs sold peaked at 56-to-1. Today it’s under 20-to-1 and still dropping — but if you include iOS devices, it’s down to 2-to-1. Staggering.

And Dediu expects parity in at most two years.