If you have a new device that came pre-installed with Office 2021 and after opening an app you see a message that says Office needs an update, you'll need to do this before you can continue using Office.
To update Office, do the following.
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From an Office app, such as Word and in the backstage area of the app, select Account.
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Under Product Information, choose Update Options > Update Now.
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Close the "You're up to date!" window after Office is done installing updates.
