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The oldest version of Win I used was 95 about 2 years ago on chromatography machine (I think hplc or gas).
It is to my knowledge still in use in the school because the software don’t run on newer machines. The teacher told me that he don’t know what will he do when it dies. It isn’t really an issue on Linux.
I think that there are more issues like archaic connectors and stuff like that. You can’t find new hardware with 30yo standard io.