Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by a 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.

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

Which macOS version is installed?

Mac OS X 10.7 'Lion' Q&A @ EveryMac.com. With the Mac OS X 10.7 'Lion' Q&A, or just the OS X Lion Q&A, if you prefer, you can get answers to all of your questions about Mac OS X 10.7 'Lion' from 'What are the 'pros and cons' of upgrading to Mac OS X 10.7 'Lion'? Everything is messed up. All the words are squeezed in the left hand side of the window and picture aren't showing up properly. The whole interface is messed up! Please help me-I will choose a best answer, I promise. I really want to get it to look normal again. How can I do this?

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

Which macOS version is the latest?

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 Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

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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