Use product key to install Office 365 home and get 60 free skype minutes

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To authenticate your installation of Microsoft Office 2013 or Microsoft Office 365, Microsoft issued you a product key code. If you ever need it again but can’t seem to find it, you have a few options to locate or recover that code
The Microsoft Office product key is 25 alpha-numeric characters and looks like XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. In most cases, the product key can be found in the product packaging but where depends on how you bought Office. office 365 product key