Pretty much the same way that early versions of Mac OS X could run “Classic” apps. (It’s kind of remarkable how Apple was able to push their entire user base i

Pretty much the same way that early versions of Mac OS X could run “Classic” apps. (It’s kind of remarkable how Apple was able to push their entire user base into a transition, and backward compatibility with that era is neither practical nor really desired. Not the case with Windows!) Anyway, yeah, there are really no technical reasons why this couldn’t be done or even difficult, the reasons why this would never happen are all strategic and enterprisey.