SGI: only added x86 servers when they were already in real trouble (http://www.networkworld.com/news/2006/062606-sgi-adds-x86-servers-in.html) Linux has not been what has done damage to SGI
SCO: Have you evere enven used their crap! I have on SCO box we had to bring in for a vendor supplied teleco system and its a nightmare. Maybe if they had concentrated on product improvement rather than lawsuits they might have been aloive longer
Cray: Got pushed by all computers capable of supporting multiple nodes, including Solaris, AIX, and Linux.
I'm sure you think it was the "evil" microsoft, even though they weren't even a serious competitor in that market. No it was Linux, only someone denying the communist ties in the parent article would think otherwise.