As usual, IBM’s iSeries (OS/400) was left out of another discussion of
operating systems. Is it sexy? Not by a long shot – but it will sit and run and run and run almost forever without a hiccup. Security is merely an afterthought – it’s built in tightly. And speed of the larger models rivals a mainframe. These machines are for people who need real, reliable work done, not worrying about how the GUI is aesthetically pleasing or not.