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Microsoft 365 and Office | Install, redeem, activate | For home | Windows
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Is this a new installation or did you move Office from one device to another?
If Office was installed on a new computer, did you uninstall from the older computer? For more on activation, see https://support.microsoft.com/en-us/windows/activation/activate-microsoft-perpetual-products-using-the-product-activation-portal .