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.

I believe win10 will work for a long time yet, I suspect that 365 will die on win 10, "for reasons"

So migrate to libre office on win 10 ASAP.

@Extelec I'm not even sure why Microsoft is insisting on TPM, secure boot and 8th gen Intel/2nd gen Ryzen CPUs – 11 24H2 runs just fine on basically any machine made in the last 15 years (the only real requirement is POPCNT support by CPU, something that's been available since 2009, and which Windows 10 did not need).
@jernej__s @Extelec FWIW Rufus (and probably other tools) will bypass the TPM and other requirements, saving us replacing a lot of hardware at my last job - and me from replacing my games computer.

@denisbloodnok @jernej__s @Extelec Rufus works fine, I have used it to upgrade a few TPM-less machines.

There's no guarantee though that Microsoft won't push an update in the future that will destroy your OS anyway, so if you can, go for Linux instead.