Microsoft MSDN Blogger, Mike Kolitz, has released his Windows Image to Virtual Hard Disk Converter (WIM2VHD) – a command-line tool that allows you to create sysprepped VHD images from any Windows 7 installation source. VHDs created by WIM2VHD will boot directly to the Out Of Box Experience, ready for your first-use customizations. You can also automate the OOBE by supplying your own unattend.xml file.
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