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11 Nov 2012  
NoelDP

Microsoft Community Contributor Award Recipient

Win 7 x64 Home Premium (and x86 VirtualBox VM)
 
 

When Windows is activated, it sends data about the hardware to the activation servers - this data is checked against previous activation data to ensure that licensing conditions are met. If the hardware has changed significantly, then it will require telephone activation as a cross-check.
Telephone activation may also be required if the total number of activations reaches a trigger-point, whether the hardware has changed or not.
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