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Apple on Thursday updated its developer website with a chart indicating that iOS 7 adoption as of December 1 is already at 74%



From TUAW:
The chart additionally reveals that 22% of iOS devices are still running iOS 6 while just 4% of iOS devices are running even older iterations of iOS.

The 74% figure is extremely impressive, and further serves to highlight that Apple does a tremendous job of releasing major iOS updates capable of running on older devices. The iPhone 4, for example, was released about three and a half years ago and still supports iOS 7.
  Apple says iOS 7 adoption is at 74%