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Guest operating systems are the operating systems which run within VirtualBox virtual machines. The list of supported guest operating systems is much larger than the list of supported host operating systems. As with host operating systems, just because an operating systems is not listed as a supported guest does not mean it will not run. In fact, in the case of guest operating systems there is a good chance that even unsupported guest operating systems will still run within a virtual machine. There are, of course, limitations to this rule. It is not possible, for example, to run MacOS X in a virtual machine for the simple reason that MacOS X relies on specific Apple hardware which is not available in a VirtualBox virtual machine.
== Supported VirtualBox Host Operating Systems ==