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Virtual PC started off originally as an x86 emulator for PowerPC Macintosh to run MS-DOS and Microsoft Windows. Connectix, the company that made it, was purchased by Microsoft. Virtual PC was then retooled into a virtualization tool for x86 systems. Microsoft discontinued Virtual PC in favor of a server-oriented virtualization product called Hyper-V.
VirtualBox is an an x86 virtualization program.
VMWare is a commercial CPU virtualizer for commodity x86 systems. Unlike a PC emulator, CPU instructions are not interpreted, but rather run directly on the host CPU alongside any other native operating system and applications.