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Back in the day there was a clear distinction between personal computers and dedicated workstations. Personal computers were cheap, underpowered and used wimpy operating systems and workstations were expensive, powerful and used powerful operating systems. At some point personal computers became powerful enough to run workstation operating systems so Microsoft started working on Windows NT after hiring workstation guys like Dave Cutler. Dave Cutler had worked on VMS which was one of the few non Unix-based workstation operating systems of the day. Apple purchased NeXT to acquire its workstation team and tech and as a bonus they got Steve Jobs who founded that company after leaving Apple. Every Windows OS of today descends from NT and every version of Mac OS X descends from NeXTSTEP. Dedicated workstation companies like Sun and SGI couldn't compete with much cheaper workstation PCs and nowadays just about every modern personal computer on the planet uses a workstation OS.