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Unix versions are the biggest competitors of Microsoft OS. Few of them are:

  • SCO Unix
  • Red Hat Linux & Red Hat Enterprise Linux (Red Hat)
  • Suse Linux (Novell)
  • HP-Unix (HP)
  • AIX (IBM)
  • Solaris (Sun MicroSystems)
  • BSD/OS (Wind River)
  • CLIX (Intergraph Corporation)
  • True 64 Unix (Compaq)
  • SPAEC 64/OS (HAL)
  • MacOS X Server (Apple)
  • NetBSD (NetBSD)
  • OpenBSD (OpenBSD)
  • OpenLinux (Caldera Systems)
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15y ago

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