But I <i>can</i> run an old OS on my new laptop.  In fact, I can run <i>many</i> old OS&#x27;s on my new laptop.  I run MacOS 6 (using vmac).  I run Windows XP (using Parallels).  I even run old Apple II software (using VirtualII).  But I can&#x27;t run Snow Leopard (only Snow Leopard Server, which is not quite the same thing) because the license doesn&#x27;t allow it, and Parallels enforces that restriction.