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How would you write out a rebranding like Mac OS X to macOS

I'd go with one of these:

* macOS (née Mac OS X)

* macos (formerly Mac OS X)

Ah yes, the classic game:

- "macos!"

- "polos!"

Didn't mean to lower case that one.

The operating system formerly known as Mac OS X

TOSFKAMOSX. Rolls off the tongue almost as well as TAFKAP.