Multitasked operations in Mac OS 8 57 4.2 Memory areas for a Mac OS 8 process with one task 60 4.3 Memory areas for a Mac OS 8 process with two tasks 61 4.4 A task blocking on a synchronous I/O operation 62 4.5 Preemptive task scheduling by the microkernel 64 4.6 Execution time divided by time slices for tasks with equal priority 65 4.7. Presenting Apple Music on Mac. The new Apple Music app is the ultimate music streaming experience on Mac. 1 Explore a library of 60 million songs, discover new artists and tracks, find the perfect playlist, download and listen offline, or enjoy all the music you’ve collected over the years. And find it all in your music library on all your devices. Berkeley Electronic Press Selected Works.

Is your Mac up to date with the latest version of the Mac operating system (macOS or OS X)? Is it using the version required by some other product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Mojave, followed by its version number. If you need to know the build number as well, click the version number to see it.

This example shows macOS Catalina version 10.15 build 19A583.

Which macOS version is the latest?

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These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Catalina. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

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If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.

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