lmm 19 hours ago

The program may work fine on its original OS, and the OS may work fine on its original hardware, but for someone trying to actually run their business or what have you on the software these facts are often not particularly helpful.

kibwen 4 days ago

Backwards-compatibility in OSes is the exception, not the rule. IBM does pretty well here. Microsoft does okay. Linux is either fine or a disaster depending on who you ask. MacOS, iOS, and Android laugh at the idea. And even the OSes most dedicated to compatibility devote a ton of effort to ensuring it on new hardware.