This headline is truly staggering: Apple sold more iOS devices in 2011 (156 million) than all the Macs it sold in 28 years (122 million).
I think it is equally if not more interesting to compare the number of iOS devices sold in 2011 (156 million) to the number of licenses of Microsoft Windows 7 sold in a similar period. Microsoft stated that 450 million copies of Windows 7 were sold from late 2009 to late 2011 (via TechCrunch), or approximately 225 million per year. That being the case, Apple is selling 70% as many copies of iOS as Microsoft is selling of Windows 7. Given the steep slope of iOS sales, it is likely that Apple iOS unit sales will surpass Microsoft Windows unit sales sometime in the near future. Wow.
If this is the case, I do not understand why Microsoft, primarily a software company, has not embraced the iOS platform. I would recommend that Microsoft get any of its other software products (Office especially, but also anything else it can), onto iOS devices as soon as possible. This sure looks like a textbook in-process disruptive innovation of the OS market to me, as expressed in The Innovator's Dilemma.