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Apple doesn’t disclose when it stops providing security updates for macOS versions. There’s no consensus on when the exact EOL date is. Lacking that information, I applied the following ruleset, which is driven by what people have observed, and seems pragmatic enough: - From Mac OS X 10.0 through 10.4, a version 10.N would be considered EOL on the day the first patch-level update 10.(N+2).1 for its N+2 successor was released. - Starting with 10.5, Apple began to support three versions at the same time. For 10.5 itself, the EOL date is difficult to pin down so I went with 2011-06-23, the date given by the English-language Wikipedia. - From 10.6 through 10.11, a version 10.N would be considered EOL on the day the first patch-level update 10.(N+3).1 for its N+3 successor was released. - Starting with macOS Sierra (10.12), Lynis counts the patch level. Any version 10.N.P can be considered EOL on the day 10.N.(P+1) is released. If that hasn’t happened, the EOL date is the day 10.(N+3).1 is released. If neither has been released, 10.N.P has no EOL date.