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I seem to recall reading that the original IBM PC was still in use at United States National Weather Service outposts. Why fix it if it isn't broken?

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Because if it breaks, there are no spare parts, the people that maintained the system are long gone and the software that it ran probably does not run on a modern computer/OS.

There are some old servers at my work.

The oldest box I've personally seen runs Windows 3.1 it is a specialized measurement instrument (Microwave radar) with a hardware card that runs in an ISA slot.

There are also a fair number of RS/6000 Unix boxes which are getting pretty long in the teeth.

For spare parts I've heard sometimes engineers buy things like Scsi hard disks off of ebay.

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