Hyper-V, like Microsoft Virtual Server and Windows Virtual PC, saves each guest OS to a single virtual hard disk file with the extension .

A new version of Microsoft Virtual PC, newly renamed as Windows Virtual PC was made available for Windows 7 Professional, Enterprise, and Ultimate editions.

Previously offered only in Windows Server, Hyper-V, a native hypervisor is now included in Windows 8 Pro, replacing Windows Virtual PC, a hosted hypervisor.

Windows Virtual PC for Windows 7 (version 6.1) does not offer a user interface for manipulating virtual floppy disks; however, it still supports physical and virtual floppy disks via scripting.

Seamless integration of Windows 3.1 and later Win32s applications in OS/2 is a concept similar to the seamless integration of XP mode based on Windows Virtual PC in Windows 7.

With the introduction of Windows 7 (Business, Ultimate, or Enterprise editions), Windows XP Mode enables full compatibility with older programs supported under Windows XP via Windows Virtual PC.

Windows XP Mode is a fully functioning copy of 32-bit Windows XP Professional SP3 running in a virtual machine in Windows Virtual PC (as opposed to Hyper-V) running on top of Windows 7.

In a blog post (via CNET), the Win7 team says, "All you need to do is to install suitable applications directly in Windows XP Mode which is a virtual Windows XP environment running under Windows Virtual PC.

A desktop virtualization solution: It allows a physical Windows 7 workstation to host one or more virtual machines that run their own operating systems on a Windows Virtual PC hypervisor, with some transparent integration of the Start Menu and desktop of the virtual machine into that of the host.