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I often set up servers in Hyper V on my laptop (running windows server 2008) to test varoius software.

Is there a way in powershell to build an image in Hyper V and run windows update on that image? Does anyone have a script that they could share?

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You can create a WIM image of the virtualized operating system, and run offline updates against it with DISM.

See here for more information: http://blogs.technet.com/b/configmgrdogs/archive/2012/02/15/applying-windows-updates-to-a-base-wim-using-dism-and-powershell.aspx

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You can do the same without making a WIM image first. Just run the offline update against the image in the VHD, by mounting the VHD. –  Jake Oshins Mar 17 '13 at 5:30

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