Apple wants you to upgrade your systems
It’s time to ensure any older Apple devices still in use by you or your company run the most recent version of the operating system available. That’s because Apple wants users to upgrade to the latest version of the device OS as the company works to expand its product ecosystem.
Upgrade the best way you can
To persuade users to upgrade, Apple plan to turn off access to services for devices running older versions of macOS 10.13, watchOS 4, iOS/iPad OS 11, and tvOS 11, a leaker claims.