• VMWare Server does emulation, runs on top of host OS
  • Proprietary, free as in beer, not speech; must register to get key (free)
  • ESX Server runs directly on hardware, like Xen
  • Not free in any way
  • VMWare products popular in business because they were the first
  • VMWare Server automatically does bridging, others default to NAT, e.g., VirtualBox
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