The Microsoft Virtual PC 2007 beta 1 is now available on Microsoft Connect in x32 and x64
What’s new in Virtual PC 2007 Beta
Hardware-assisted virtualization
Virtual PC 2007 includes support for virtualization technology from Intel and AMD. By default, hardware-assisted virtualization is enabled if the feature is enabled on the physical computer. You can turn this assistance on or off for each virtual machine by modifying the virtual machine settings.
Support for Windows Vista as a host operating system
This beta release of Virtual PC 2007 introduces support for Windows Vista as a host operating system. The following versions of Windows Vista are supported: Windows Vista Business, Windows Vista Enterprise, Windows Vista Ultimate.
Support for Windows Vista as a guest operating system
This beta release of Virtual PC 2007 introduces support for Windows Vista as a guest operating system. The following versions of Windows Vista are supported: Windows Vista Business, Windows Vista Enterprise, Windows Vista Ultimate.
Support for 64-bit host operating system
This beta release of Virtual PC 2007 supports 64-bit host operating systems. However, there is no support for 64-bit guest operating systems
click here for further information