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Switching to a new version of Windows is virtually a nightmare if you have to manage more than 100 PC. This is why I value a lot a tool like Microsoft Deployment Toolkit 2010 Beta 2. A tool that can be downloaded here.

MDT 2010 is the next version of Microsoft Deployment Toolkit, a Solution Accelerator for operating system and application deployment. New features such as flexible driver management, optimized user interface workflow, and Windows PowerShell^™ can simplify deployment and make your job easier. MDT 2010 will support deployment of Windows 7 and Windows Server 2008 R2 in addition to deployment of Windows Vista^®, Windows Server 2008, Windows Server 2003, and Windows XP