Are there issues with iOS 10 in a mixed iOS 9 / OS X El Capitan environment?
I would like to update my iPhone 6 to iOS 10. However, at the same time I will not be able to update my iPad 3 (currently on iOS 9.3.5) and also not my iMac from El Capitan to Sierra later this month as they are no longer supported by the new operating systems.
My question: Are there any compatibility issues with respect to synchronizing my data across the three devices if I update my iPhone to iOS 10 with the other devices still running on iOS 9.3.5 and OS X El Capitan?