I already posted here I'm rejecting the use of the 64bit VFP"10" on the basis if it's illegality, there are copyright laws beyond just an agreement.
Well, an EULA also is legally binding, I understand that, but the basis for that agreement has changed. Windows isn't a major product to lose sales of. So legality aside, there is less concern to sue from MS.
Besides, in case of a contract you don't sign by buying in Germany, there already have been lawsuits in Germany MS lost, IIRC about the legitimacy of reselling a Windows version, especially bundled OEM, as used software, without also reselling the hardware it once was bundled with when originally buying the OEM version. So, for example, you can sell your Windows when your computer broke and you needed a new one with a new Windows version, the license is not lost with the end of life of the hardware.
There always are higher laws governing with higher priority over any specific contract of two parties. And as long as nobody sues it is an open question whether the binding to an OS is really a valid stipulation MS can enforce, the current nature of Windows and the deprecated state of VFP makes it even more likely to win that case, if you ask me, because one day it may even become an essential reason to move over to ReactOS or similar or stay with older Windows versions, if you need to run your applications and they stop working on new versions. And in regard to the unsafe state of older unsupported Windows versions, you might go for ReactOS instead of Win10, so that'd not be a strict argument for MS to force you staying on the Windows platform. Can they force you to stop your old system? Can they force you to run on an unsupported unsafe Windows version, if there may still be a safe ReactOS version running it? That's perhaps an advantage of entering the realm of oldtimer status, perhaps more about the business relevance status. The stupidity of the business owner rather is about staying with old systems in general and not innovating regularly.
So the downside I see: Old software might never get that protection status as oldtimer cars, though. And the line of arguing also fails, if you explicitly plan to do new things on this platform and are not just conserving the working state of an old software.
Bye, Olaf.