We still have quite a few XP machines left in our engineering manufacturing company.
They are on things like a specialist label printer, an EPROM/FLASH programmer, sign cutter and freight company weighing machine. None have Internet access, most don't have any form of web browser. Most will be stuck at XP for ever as either need ISA bus for a controller card, old XP only SCSI card and software that just doesn't work under Vista/Win7/8.
Most just work fine, type in numbers & letters into label printer software, press go...out come nice printed labels to label products. Under Win7 the software fails to allow open/save/file actions, so fail there. Later software version is available at £xxx works with Win7 but doesn't support a parallel port printer so would involve purchase later version of printer at £xxxx. Why change it still just works,
Want freight label, place box on scales, press button, nice freight label printed. Done.
So this is why so many companies are still using XP in all types of places as it just works and has worked for years.