Terry Lambert

Engineer who led macOS Unix compliance effort

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Last updated Oct 22, 2026

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Apple's macOS dropped from official Unix registry

Rule Changes

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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