I have half a dozen machines, all running XP because that is the last system I can run the proprietary software I use for work on.
Pity, too, because I can do what I need just fine with it. The only sad part is that as I resurrect old machines to run it, I can't do a new OEM install because the verifying servers will not recognize the license (maybe the XP ones are done). I have two unopened copies I didn't get onto machines before MS shut down or I'd have them up, too.
They discontinued free support in January 2015, and will end all updates except security updates in six months. All security updates will end in 2020. Support is available on a payment per incident system, which will end someday. You can pay for "extended coverage", as well.
It might be possible to create a virtual XP machine using VirtualBox or VMware and clone it on as many boxes as you like, with no need for further XP installs.
The real world doesn’t run on micromush’s support.
I too have software that needs XP, as well as software that needs real DOS 6.22, so I have machines dedicated to both, and the DOS machine multi-boots to DOS or Win 98SE, so that I can transfer data by USB2.
None of this is going away, because that is how the world of engineering operates.
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