And the others made their money with something else. I wonder how much richer they'd be if they hadn't been shipping millions of dollars to software companies.
open source has damaged IBM, SCO, SGI, Sun
If you compare, IBM isn't doing much worse than Microsoft.
SCO was a poorly managed company from its Caldera beginning, performing worse than other Linux companies. Their UNIX business purchase was an effort to get distribution channels for Linux. Their real downfall was becoming a lawsuit mill instead of concentrating on producing goods and services.
Sun wasn't killed by Linux. It was killed because it was mostly supported by the dotcom bubble (and crashed with it) and cheap x86 hardware was surpassing SPARC in performance giving people no reason to blow five figures on their hardware anymore.
HA! Microsoft is at record profits, as usual, while IBM is selling off divisions. For the last year, what is that, about a 20% gap that formed? Yep.