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Someone was maintaining a MySQL build for OS/2 up until 2019!?

Better yet: there is a company that is still currently maintaining and selling a commerical copy of OS/2![0]

As an IBM product, OS/2 was part of some very long support contracts with companies like banks that also had z/OS mainframes.

There was OS/2 in some ATMs well into the 2000s, but I don’t know when those might have been replaced.

Pretty sure MTA (NYC subway) ticket machines were running OS/2 into the mid 2010s and maybe still are.