"UNIX may account for about a third of the server market, but its upstart cousin is slowly but surely eating in to that share. It's not that there's anything wrong with UNIX — far from it. It's just that Linux is becoming increasingly capable of doing the less-demanding tasks that UNIX has historically been asked to do.
"Vendors like Sun and HP are covering their bases by offering hardware with Linux as an alternative to the proprietary Unixes they sell. It's a tricky act to pull off. You can't go around binging up the benefits of Linux too much if you don't want to undermine your UNIX business, but if customers are going to move to Linux anyway, then you must make some noise in that department."
