A guest operating system is the system that runs in a virtual machine. Fusion supports importing Parallels and Virtual PC virtual machines with certain operating systems.
Fusion supports importing the following operating systems:
Microsoft Windows 10
Microsoft Windows 8
Microsoft Windows 7
Microsoft Windows Vista
Microsoft Windows XP Service Pack 3
Microsoft Windows XP Service Pack 2
Virtual machines must be powered off before you import them.
If your copy of Windows was not licensed with a volume-license key, you might need to reactivate it when it starts inside Fusion.