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How to contact a Microsoft Product Activation Center by telephone
Provides steps on how to find a Microsoft Product Activation Center phone number.
Find your product key for Office 2013 and Office 365 Home Premium - support - Office.com
You need a product key to activate Office. The product key is found in different locations depending on how you bought Office.
Activate Office 2013 programs - support - Office.com
To activate an Office 2013 program, you must enter your 25-digit product key, if you haven't already done so during Setup.