• Note: The headings on this list indicate the Macintosh System bundle names; the bullet points indicate the version of the System File included in that bundle. This is to make it clearer for people searching for specific bundle versions as opposed to System File versions. Finder File versions are not indicated. 1 Classic Mac OS 1.1 Macintosh System Software (0 - 0.3) 1.1.1 System File 1 1.1.2.
• Mac Navigating by character, or interacting with, the text in the awesome bar does not speak the c 735012 JS OOM Testing: Assertion failure: f.cx-typeInferenceEnabled, at methodjit/MonoIC.cpp:1173 or Cra.
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As we shared earlier today, the macOS operating system — formerly called Mac OS X — is turning 20 years old this Wednesday, March 24, 2021. To celebrate the occasion, none other than Scott Forstall decided to use his Twitter account tonight to congratulate Mac OS X.

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In a post on his personal Twitter account, which he doesn’t use often, Forstall celebrates the 20th anniversary of Mac OS X and remembers when Steve Jobs decided on the name for the 10th version of Apple’s operating system.

“I still remember when we named you. In a small room in IL1. When Steve slashed a large X on the wall and smiled. Look at how far you’ve come from a young Cheetah,” said Forstall. The system was named Mac OS at that time, but Apple had been working on a completely new version that came to be Mac OS X.

Long-time Mac users may remember that the first versions of Mac OS X were named after big cats, but that was only because Apple used “Cheetah” as the codename for Mac OS X 10.0. After that, the company decided to use the big cat names for other versions of OS X, such as Puma, Tiger, and Leopard.

Scott Forstall worked for NeXT with Steve Jobs since 1992 and joined Apple in 1997 after the company was acquired. He became SVP of software at Apple in 2003 and was deeply involved with the development of iPhone in 2005 — which made Forstall to be considered the “father of iOS.” In 2006, he took the lead in the development of Mac OS X as well.

Forstall left Apple in 2012 after the Apple Maps controversy in which the company replaced Google Maps with its own map solution, which was deemed unfinished and buggy. He was mainly replaced by Craig Federighi, who leads Apple’s software engineering to this day.

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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.

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

Which macOS version is installed?

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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.

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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.