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Select your version of Microsoft 365 below to learn how to activate Microsoft 365.
Activate Microsoft 365 or a non-subscription version of Office
Activate Office that's pre-installed on a new Windows device
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Troubleshoot activation errors
Activate Microsoft 365 or a non-subscription version of Office
When you start an Microsoft 365 app that's not activated, you'll be prompted to sign in to Microsoft 365. Be sure to sign in using the Microsoft account, or work or school account, that you used to buy or subscribe to Microsoft 365.