Re Microsoft win 10 machines.

Don't believe Microsoft

"because they can’t be upgraded to a supported OS there will not be the normal secondary market for those buying new hardware. This means there’s no boon for charities or other good causes, and instead this is a recycling or landfill choice.

This is criminal.

Recycle to Linux.

@Extelec with all the speak about linux still running on old hardware: yeah but there comes a point where it gets really painfull.
Linux is better in this regard but not perfect. Let me sing you a song of how I struggled to browse the web on a 1999 IBM Thinkpad T23 with a Pentium III CPU.
No modern browser supports that CPU. You can modify firefox with enough technical knowledge to run on that thing but... apart from some very simple text based browsers, no support for that CPU.

@martinschlegel @Extelec
A 1999 ThinkPad. Is that the one with the butterfly keyboard?

Edit: the butterfly keyboard ThinkPad (701) is from 1993, and it has an i486 processor.

@dec23k @Extelec nope, but you can literally dance on top of it without dmaging the machine xD
@martinschlegel @Extelec
Just be sure to spin the HDD down and close the lid first, right? ;-)