"From Friday through July 11, consumers in the U.S. will be able to buy an upgrade copy of Windows 7 Home premium for $49 or Windows 7 Professional for $99.
That offer is good for both XP and Windows Vista PCs, regardless of whether someone has been trying out the pre-release version of the operating system."

So for a couple of weeks I can get it for $49/$99?
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"Panta Kopros".