Same issue goes on today with Mint 11. It appears that Windows Virtual PC is geared towards business/corporate users.
Anyway, VirtualBox & VMWare Player are preferable products over Windows Virtual PC. The only use that I ever had for it, was that with Windows 7 (versions Pro & Ultimate) offers XP Mode, which is a free XP VM, mainly for businesses that ran XP for many years to be able to adapt to Windows 7. It allows for older software & some hardware (printers) to run on Windows 7.
Unless one really needs it, I recommend VirtualBox or VMWare Player.
Proud Linux Mint user since 2009