Before you reinstall Office for corporate use, we recommend that you uninstall Office first. After you've uninstalled Office, follow the steps below.
Important: In Japan, Office perpetual products included on Office preinstalled PCs sold for corporate use, and a personal Microsoft account are not required to activate the Office apps.
Reinstall Office
The steps you follow will depend if you have a product key, if you don't have a product key, or if you plan to install Office from an installation disc.
Select the correct tab for how you want to reinstall Office.
If you have a product key, follow these steps.
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Go to https://setup.office.com and select Get Started button
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Sign in using your Microsoft account.
If you don't have a Microsoft account, you can create one.
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Enter your Office product key and select Next button
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Check the product name displayed correctly in the next screen
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Select a language from Language menu and select Redeem button
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Select either Download 64 bit or Download 32 bit button to get an installer
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Run the installer to install the Office apps
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When the installation is finished, start an Office app, like Word. (Please refer the topic, Can't find your Office apps?)
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Accept the license agreement when prompted. Office is ready to use.
Starting year 2022, Office pre-installed PC bundle an Office digital license instead of an Office product key card. To reinstall Office apps activated by the Office digital license, you must perform the steps below in the Microsoft Store app.
Reinstall Office from Microsoft Store Library
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Open the Microsoft Store app. (If you have signed in the app with your Micrsoft account, please sign out the app.)
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Select the Library icon and then the Apps tab
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Turn off the Show installed products only filter under the Sort and Filter button or [↑↓] button
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Find your Office product in the Apps tab, and select Cloud button.
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Office installer (setup.exe) will be downloaded
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Start the installer and follow the prompts to install Office apps
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Start an Office app from Start menu
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Accept the license agreement when prompted. Office is ready to use.
Note: If you install Office apps from Microsoft Store app, Office apps will be installed in the same edition as the bit edition of Windows by default. You can't install 32-bit edition of Office apps if 64-bit edition of Windows runs on your device. If you have uninstalled the preinstalled Office apps or clean installed another Windows before activation for Office apps, please refer the answer for the following question in "Frequently asked questions for preinstalled Office". "I uninstalled pre-installed Office apps before activation. How can I install and activate Office?"
Microsoft had provided an installation media for Office 2016 or Office 2019 pre-installed device. If you had requested an installation media for Office 2016 or 2019, follow this procedure to reinstall Office. You need a product key bundled in your Office pre-installed device.
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Insert the DVD. You might be prompted to run setup.exe automatically. If not, open the DVD in Explorer and double-click setup.exe.
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Wait for the installation is complete and select Close when prompted.
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Start an Office app, like Word. Can't find your Office apps?
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On Sign in to set up Office screen, select I have a product key link below the buttons.
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On Enter your product key screen, enter your product key and select Activate Office.
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Accept the license agreement when prompted. Office is activated and ready to use.
Note: If your device isn't connected to the Internet, the Activation Wizard appears so you can activate by phone. Follow the prompts in the wizard to complete the activation process.
