Problems in Switching a Virtual Machine from VirtualPC to Hyper-V

I do a lot of development using VirtualPC images.  It keeps my base laptop relatively clean and allows my VPC images to join client domains.  Recently, I rolled on to a project that had a very large VHD file.  The file was too large to host on my laptop, even after compressing the VHD.  Initially, I created a VPC with the VHD hosted on a USB external drive but the performance was simply not acceptable.  The project did have a spare machine running Windows Server 2008 R2 Enterprise, with the Hyper-V role installed.  Luckily, the VHD format is common to VPC and Hyper-V. 

I created a Hyper-V virtual machine based upon the VHD.  Everything worked except for the mouse.  After a lot of banging around, I came to the realization that the VPC extensions were not compatible with the Hyper-V setup.  In the end, I had to take the VHD image back to VPC, un-install the VPC extensions, return the VHD to Hyper-V, and install the Hyper-V extensions to get the mouse to work properly.  Now, everything is goodness.