Matthijs ten Seldam has produced a very cool tool that allows import existing virtual machines from Virtual PC and Virtual Server in Hyper-V.
VMC to Hyper-V Import Tool (VMC2HV), imports the configuration from a Virtual Machine Configuration (VMC) file. Both Virtual PC and Virtual Server use VMC files to store the hardware and other properties of a VM. It reads the VMC file and maps all relevant properties to those for a Hyper-V VM.
Continue at source: Matthijs’ blog