How to Use Your Microsoft Office Product Key


If your Office or Microsoft 365 purchase came with a product key, enter it at one of the product websites below for your product. Enter your key to download and install Office or renew your Microsoft 365 subscription.

Having problems with your product key?

Example of an Office or Microsoft 365 product key:


To Redeem a new Purchase

1: Go to or

2: Sign in with your Microsoft account, or create one if you don’t already have one. Be sure to remember this account so you can install or reinstall Office later without a product key.

Important: 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.

3: If prompted, enter your product key without hyphens. If you don’t see the option to enter your product key, it was already entered for you.

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 or, this means your product key has already been redeemed and is no longer needed.

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

Note: 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 Office 365 Home subscription benefit.

How to Install Office through Microsoft Workplace Discount Program (formerly known as the Home Use Program, or HUP) 

These steps apply only to Office Professional Plus, Visio Professional, or Project Professional.

1. Start any Office app and do one of the following:

If prompted to “Sign in to set up Office“, select “I don’t want to sign in or create an account” (the small link at the bottom of the window).

sign in to office

If you see “Hello, confirm your account”, select “Use a different account” and then “I don’t want to sign in or create an account”.

confirm your microsoft account

2. On the “Enter your product key” screen, enter your product key to activate Office.

3. Agree to the License terms by selecting Accept and start Word.

Microsoft 365 Business Standard

1: First, Go to

2: Without using hyphens, type the Office product key and then click Next.

3: To complete the redemption and setup process, follow the prompts.

Microsoft Store

1: Visit and navigate to the upper right corner of the screen and select Sign In with the Microsoft account that you used to purchase Office.

2: After signing in, select your name in the upper right corner, and then choose Order History.

3: Then you need to locate the Office one-time purchase or individual Office app, and then select Install Office to view your product key (keep in mind this doesn’t actually install Office).

4: In the window with the product key, select Install Office again..

5: Lastly, you will be redirected to a page that says Hi. Let’s get started. Follow the prompts to sign in again and associate your product with your Microsoft account.

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