Can't Delete IP Address from Hyper-V Virtual Machine
I've had a number of problems with Windows Server 2008 Hyper-V guests that hold onto their original IPv4 address after running SysPrep. SysPrep is supposed to remove this kind of server-specific information, but for some reason this isn't happening
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Read the complete post at http://www.expta.com/2010/06/cant-delete-ip-address-from-hyper-v.html