As announced a few weeks ago, October 11th was the day for the Virtual PC 2007 beta to begin and it has.
Source: Microsoft Connect
Go to Microsoft Connect to login and download.Virtual PC 2007 Beta Program
Welcome to the Virtual PC 2007 Beta Program. This Beta program allows you to evaluate and test pre-release software, as well as provide feedback to the Microsoft Virtual PC Product Team.
What’s new in Virtual PC 2007 Beta
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.
* Installing Virtual PC 2007 Beta on a computer that has AMD hardware-assisted virtualization support and uses an x64 version of Windows as the host operating system may generate a bug check and shut down the operating system. This occurs because x64 versions of the Windows operating system protect a critical system register that Virtual PC 2007 modifies to enable hardware-assisted virtualization. You can resolve this issue by installing a hotfix prior to installing Virtual PC 2007. The hotfix is available and can be downloaded from this beta site by clicking on the ‘Downloads’ link on the left pane of this page.
Complete Virtual PC 2007 Beta Release Notes are included in the installer and provide important information and usage instructions for the new features. It is highly recommended that you fully read these Release Notes. After installation, the Release Notes can be located in '%windows%\Program Files\Microsoft Virtual PC\Documentation\English'.
Download Virtual PC 2007 Beta
Both the 32-bit version and 64-bit version of Virtual PC 2007 Beta are available. Please click on the 'Downloads' link (on the left pane) and follow the download directions. Note: A product key is not required for this release.
The Virtual PC team takes your feedback and bug reports seriously. Your feedback is used to make our products and technologies better. To provide feedback or submit a bug, please click on the 'Feedback' link (left pane) and search for your issue. If not already entered by another beta-user, click on the 'Submit Feedback' link and enter you feedback or bug information.
We thank you for your help in making Virtual PC 2007 the best release possible through participating in this Beta.
If you have questions or issues with the Microsoft Connect site, please refer to the 'contact us' page within the Microsoft Connect web site. Feedback and bugs regarding Virtual PC 2007 Beta should be posted using the 'Submit Feedback' tool. For other issues, contact firstname.lastname@example.org.
Microsoft Virtual PC 2007 Product Group
Source: Microsoft Connect