To check whether Windows is installed as 32 or 64 bits, see Which Windows operating system am I running? Table of contents. Office install. How to install Office.
Redeem or activate. Office product keys. Activate Office. Install other apps. Set up mobile devices. Office updates. Upgrade to the latest version. Troubleshoot and uninstall. Do one of the following: If you're signed in, select Use a different account , and then select Enter product key instead.
If you're not signed in, select Enter product key instead. If your product key is new, follow the prompts to complete the redemption process. Office begins the update process. Close all Office apps to finish the process. Type Command Prompt. Select your Office and Windows version. Need more help? Join the discussion.
Was this information helpful? Yes No. Thank you! Any more feedback? In Office , change product key in Backstage View by going to the File tab and clicking the Help tab in the left pane of the window. Click the Change Product Key link in the About section of the window. The Product Activation window will open.
Type your new product key into the box and then wait while your key is validated. Once it has been validated, click the Continue button. Click the Install Now button and wait while Office is configured with the new product key. The second option you have is to change the product key via the Control Panel. Find Microsoft Office in the list of currently installed programs. Locate the Office one-time purchase or individual Office app, and then select Install Office to view your product key this doesn't actually install Office.
Note that this product key won't match the product key shown in My Office Account. This is normal. If Office came in a box, card, or disc, look for the product key on the card or on the packaging that came with Office. If the product key isn't there, read the instructions on the package. You might be directed to go to Office. You can no longer redeem the character alpha-numeric PIN shown on the product key card to retrieve your product key.
You need this product key to install Office If you never redeemed the alpha-numeric PIN and don't have a product key, you won't be able to complete the installation and activation. If you do have the key and need install help, see Install Office and Activate Office If Office came with your PC, Mac, Laptop, or tablet, look for the product key on the Certificate of Authenticity that came with your computer.
Tip: You may have one certificate of authenticity for Windows and another for Office. If you lost your product key but have a valid proof of purchase, see Contact support about your product key at the bottom of this page. Microsoft support may be able replace your product key or provide other options. If you believe the product key has been lost, stolen, or misplaced and you simply would like to purchase a newer version of Office, you can go to Buy Office to see your purchase options.
Expand a section below to find product key information for other versions, troubleshooting help, and other useful information. There are several reasons why you might get an error after entering a product key. For example, the product key may have been mistyped or a product key for a different product might have been used. Are you entering a product key for another Microsoft product? Most Microsoft products use a character product key.
Here are some common things that can happen:. These product keys are normally for Microsoft Windows. Using the product key from an earlier version of Office.
Using the product key from an individual program to install a suite. Using the product key provided by a school or company. Schools and companies usually buy a different type of Office license. The product keys they provide to students, teachers, and employees are known as volume license keys. If you're having trouble reading the characters in your product key, here's an example of what the letters and numbers look like:.
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