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Activate a brand new Office or Microsoft 365 product key. go to Office.com/setup or Microsoft office 365 setup and follow the on-screen prompts.Microsoft account. After you redeem your key, you can install Office Get help with Office.com/setup.When you start an Office app that's not activated, you'll be prompted to sign in to Office. Be sure to sign in using the Microsoft account, or work or school account, that you used to buy or subscribe to Microsoft 365.