For those of you who don’t know about the VHD Test Drive site, its a Microsoft site, where you can download pre-built Virtual Hard Disks, containing Microsoft OS’s and Server Applications like Exchange 2007.
These are a pretty handy selection of VHDs to have in your Library, as they’ll enable you to quickly deploy the technologies for test/dev purposes. In terms of what’s available:
All of the Windows Server 2008 VHDs are designed for Hyper-V, so you’ll need to run them on that platform. Exchange Server, Windows Server 2003 and below (on the list) are designed for Virtual Server 2005 R2 SP1, and the Vista VHD is designed for Virtual PC 2007.