Operating Systems

• Microsoft Windows, personal computer and WS.
  proprietary product, no obligations to hardware,
  
  rapidly adapted to new requirements

• UNIX, an open systems, consensus and takes time.
  • SUN servers
  • LINUX clients and servers, free, low entry cost
  • ….

• Mainframe operating systems, little growth expected

• VMS (COMPAQ) reliable 24 hour / 7 day

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