Microsoft has released Windows Server 2008 evaluation VHD (Virtual Hard Drive) images for Hyper-V which as of now is available for download from Microsoft Download Center.
The images are perfect for creating testing environment and trying new versions
- Windows Server 2008 Standard Ed. x86 (full install)
- Windows Server 2008 Standard Ed. x64 (full install)
- Windows Server 2008 Enterprise Ed. x86 (full install)
- Windows Server 2008 Enterprise Ed. x64 (full install)
- Windows Server 2008 Standard Ed. x86 (core install)
- Windows Server 2008 Standard Ed. x64 (core install)
- Windows Server 2008 Enterprise Ed. x86 (core install)
- Windows Server 2008 Enterprise Ed. x64 (core install)
- Exchange Server 2007 SP1
- Windows Server 2003 R2
- System Center Configuration Manager 2007 R2
- Office SharePoint Server 2007
- Forefront codename "Stirling"
- System Center Essentials 2007 SP1
- Windows Vista
For more resent list of available preconfigured VHD’s visit http://www.microsoft.com/vhd
You may also like -
Download Free Windows 7 GuidesMicrosoft Released Several Windows 7 guides for download Power Management in Windows 7 Overview Enterprise Search in Windows 7 Overview Windows 7 Manageability Overview ... 
Convert VMDK to VHD files - DownloadDownload Free converter from VMware VMDK to Microsoft VHD Download from VMtoolkit
Windows 7 - 90 days TrialMicrosoft released windows 7 enterprise edition for trial The evaluation version will work for 90 days. To download :press on windows 7 logo Read more
Windows Mobile Emulator OS and ImagesMicrosoft have a local version of Windows Mobile emulator , this version can be used for development and testing of mobile application. Network administrators ... 