If you are unable to find your Microsoft office.com/setup 2016 product key, or you want to reinstall your office, if you associated a Microsoft account with Office, you don't need a product key for MS office 2016; If install office is prompting you for an ms office 2016 serial key, you can enter your Microsoft account instead. Try selecting the Sign in with an active account instead link in the Enter your ms office 2016 key dialog box and sign in with the Microsoft account that you associated with Office.
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