This is totally me just being naive, I don’t work in the software realm but do have an interest possibly one day, but if we have stuff that’s been able to run (seemingly) successfully for years, or maybe even decade, what maintenance needs to even be done on old programs? Is this simply for people discovering security vulnerabilities and patching them? Is there more to it than that?
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A specific example comes to mind for this. We had software that was run on a local network through the IE browser (software was written 20 or so years ago). There was an update that restricted how much information can be passed through popup windows. The menus on the website had a popup filter, and in that filter were sections to look up certain factors (example, a popup to pick specific dates on a calendar, or a search function to find multiple companies). We had to rewrite the popup-in-a-popup that was originally written because of this IE update a decade or two after it was first constructed.
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