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It has gone through a thorough and rigorous refurbishing process as well as Quality Control Testing. No more keying in 25 tiny, hard to see, characters or loading time to activate. It will automatically activate once the license agreement is accepted with the click of a mouse! Many of the others are just Microsoft Registered. These sellers aren't able to offer the same level of quality. Buy with confidence from the No. 1 Microsoft Authorized Refurbisher in the United States.