PC operating systems (single user)

• Usage share of operating systems
  • Desktop and laptop computers

Microsoft dominance, but not quite monopoly.
Even 1 percent of these numbers is millions of machines.

Desktop Operating System Market Share 2020 by netmarketshare.com.
Do one month span only to get bar chart.
Netmarketshare shut down in 2020.

PC operating systems

• Windows (came from DOS, which came from CP/M)
• macOS (formerly called "Mac OS X", came from UNIX)
• UNIX / Linux

• historical
  • OS/2
  • "Classic" Mac OS

  
  

• Comparison of operating systems
• Comparison of operating system kernels
• Comparison of open-source operating systems