Less than two weeks ago, iOS 9 adoption stood at 61%. The iOS 8 or newer adoption rate was 91%.

Now (as of November 2nd), the iOS 9 rate is 66%, but the iOS 8 or newer rate held steady at 91%.

One possibility for that steady state 91% adoption rate is that those 9% slow-to-adopt devices are out of service, piled up in the backs of drawers and dusty bookshelves.

If we discount those older devices, that leaves us with an iOS 9 adoption rate of closer to (.66/.91) or 73%.

UPDATE: Loop reader Robert Gaugl made the point that Apple’s official adoption numbers are based on App Store data, so the out-of-service iOS devices would not be counted. I wonder why that 91% rate is holding steady. Will see if that number budges in next month’s numbers.