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If your talking about the operating system of a PC then it depends. Some computers come with the preinstalled OS itself. Usually computers have the Windows OS and there are different versions of Windows as well. XP, Vista and seven are the latest and most commonly used windows OS at the moment worldwide. Apple computers come with the preinstalled MAC leapord OS and unlike other computers those computers cant be booted with any other OS other than the MAC OS itself.

Then there are the machines that are not personal computers:

  • There are IBM mainframes which run the Z/OS system. It will also run linux.
  • There are the IBM power systems which run AIX (a version of unix), Linux, and IBM i operating System.
  • There is the OpenVMS system, originally by Digital Equipment Corporation, bought by Compaq, then bought by HP which licensed its development exclusively to VMS Software Inc. (VSI). Latest versions runs on Intel Itanium architecture.
  • There are many flavors of unix by different companies for different platforms (machines).
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