To redeem a new purchase

Step 1: Go to www.office.com/setup or Microsoft365.com/setup.

Step 2: 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:聽If you're renewing your Microsoft 365 subscription, enter the Microsoft account that's associated with your subscription. I can't remember my Microsoft account.

Step 3: Enter your product key, without hyphens, if prompted. If you don't see the option to enter your product key, it was entered for you automatically.

Step 4: Follow the prompts to finish the redemption process.

To install or reinstall Office

If you see the error This product key has already been used when you enter your product key on www.office.com/setup or Microsoft365.com/setup, this means your product key has already been redeemed and is no longer needed.

Instead, use your Microsoft account to sign in to account.microsoft.com and install your Office product.

Note:聽If you're trying to allow up to 5 other people to install Office using your Microsoft 365 Family subscription, see How to share your Microsoft 365 Family subscription benefit.