You were sold a silly idea: that the reason software isn't portable has to do with work and resources. That's simply not true in a vast majority of instances. C

You were sold a silly idea: that the reason software isn't portable has to do with work and resources. That's simply not true in a vast majority of instances. Companies intentionally lock software to certain platforms for sales reasons much, much more often than for technical reasons. OTOH, Windows isn't portable, so if you want to run old Windows software, you don't move it - you emulate it.