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If you see the message "This product key has already been used," this means that you've already redeemed your product key and added your Office product to your Microsoft account. Don't worry, this message doesn't mean you can't install or activate Office.

Use your Microsoft account to install and activate Office

Use your Microsoft account, not your product key, to install and activate Microsoft 365, Office 2016, Office 2013 and individually purchased Office apps, such as Project, Visio, Word, Excel, and Outlook.

Sign in to install Office

Bookmark the site below so you always know where to go to install Office.

Services & subscriptions

Sign in to activate Office

If an Office app prompts you to activate, sign in with your Microsoft account instead of a product key.

Use the right Microsoft account

Make sure you sign in with the Microsoft account that you used to buy Office.

Find the account you use with Office

Note: There's no need to go to to install or reinstall Office later. This site is only used for redeeming new, unused product keys after purchase. After your product key is redeemed, your Office product is added to your Microsoft account and you don't need a product key to install or activate Office.

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