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#11
I tried to suggest this last week as a way to use the RTM to clean install on factory OEM licensed machine, and was accused of providing a "hack" by Snuffy.
The original tutorial and top Google result for unlocking all versions in Win7 is from this very forum: Unlock ALL Versions in your Windows 7 Build 7000 ISO
The reason it is germane is because clean reinstallers like me need access to a clean copy of required version to overcome bloaty factory installs. The legal OEM license activates with a robo-call to MS, at most, since most stickers have batch keys now (overcome by reading key ahead of time with Belarc advisor and inserting it last).