If you bought Microsoft 365 at a store, you may have received a product key. Here's how to redeem it.
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Go to Office.com/setup.
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Sign in with your Microsoft account, or create one if you don't have one. Be sure to remember this account so that you can install or reinstall Office later, without a product key.
Important: If you're renewing an Microsoft 365, enter the Microsoft account that's associated with your subscription. I can't remember my Microsoft account.
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Enter your Office product key, without hyphens.
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Follow the prompts to finish the redemption process.
Note: If your work or school gave you Microsoft 365, you won't need to redeem a product key. Your admin did it for you.