OS X El Capitan will run on almost 90% of all current Macs, even though it’s very unlikely that the just-unveiled operating system will ever boast such a high adoption rate.

And in a departure from past practice, Apple on Monday said that iOS 9 will run on all the devices able to run 2014’s iOS 8, meaning that a larger chunk of the iPhones, iPads and iPod Touches now in use should be able to upgrade this fall than in years past.

The estimate for eligible Macs was 10 percentage points higher than last year for Yosemite, a reflection of the features pause that Apple instituted for OS X 10.11, named El Capitan (El Cap) during the WWDC keynote address Monday.

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