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Apr 15, · A Microsoft account or a product key is needed to activate, install, and reinstall Office. Microsoft Product Activation is designed to certify that software products are legitimately licensed. Activating the product will give you a functionality to use all its features. To install Office using a product key, refer to these steps: Go to. Windows 8. Close all Office apps. In Windows 8, move your mouse to the upper-right corner of your screen to open the charms bar, and then select the Search icon. Type an application name, like Word. The Word program icon appears in the search results. Right-click the Word icon, and select Run as administrator. Select Yes to allow Office to run.