Comment by cherryteastain

Difference is Sun was providing a "full stack" proprietary product including CPUs running a proprietary ISA, Unix OS, compiler, desktop environment and productivity apps. All that Dell does is assembling standard, commoditized parts and putting a free OS on it. Dell's business is incredibly easy to replicate, while Sun's business is extremely hard to replicate. Of course, Sun's competitive advantage turned into a curse when the components of that vertical integration become uncompetitive both features and price wise vs. the GNU/Linux-on-Intel stack. But regardless, Dell could never replicate the vertical integration Sun had.