Software and data
Legacy system
Software a business still depends on that is no longer supported, updated or well understood, and that nobody wants to touch.
What legacy system means in practice
Legacy does not mean old. It means the knowledge has gone: the supplier has stopped supporting it, the person who understood it has left, or the version is too far behind to update safely. Plenty of perfectly old software is not legacy because someone still maintains it.
The risk is rarely that it stops working. It is that it constrains everything around it, keeps an unpatchable operating system in service because nothing newer will run it, and holds data nobody can extract. Replacing it wholesale is usually the most expensive option. Getting the data out into somewhere current, and letting the old system shrink to the one job only it can do, tends to cost far less.
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