Fred Zlotnick

Former Sun Microsystems engineer, worked on macOS certification

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Last updated Oct 22, 2026

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Apple's macOS dropped from official Unix registry

Rule Changes

Retired from Apple in 2023

Apple's macOS has been removed from the Open Group's UNIX 03 certification list, the last register page where it still appeared in mid-October. That leaves IBM's AIX as the only system certified to the current UNIX 07 standard, according to OSnews.

Updated Oct 22