You'll need to redeem the Office product key if this is the first time you are installing your copy of Microsoft 365 or Office. Click Continue for steps on how to redeem your key.
You will not need to redeem a product key under these circumstances:
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You have already installed your copy of Office and redeemed the product key previously
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You purchased Microsoft 365 online directly from Microsoft, in which case you can install it directly at account.microsoft.com.
