About macOS Versions

Apple releases a new major version of macOS per year, usually end of summer / early fall. Apple makes no committment for the date until which any given OS version is supported. In general the three most recent releases receive security updates, but we have seen cases where a new major version was released without the corresponding security updates for previous versions.

Make sure you always run a supported version of macOS.

We assume that at the time being the following versions of macOS are supported:

If you use a Mac that runs a macOS version older than 10.14 you should check whether the device can run at least 10.14 and upgrade as soon as possible. If that device can not run 10.14 you should consider replacing it asap.

To ease the upgrade for the stragglers we have kept some of the documentation of the more recent unsupported versions: