A product key is a 25-character code that is used to activate Microsoft Office and verify that it has not been used on more devices than the Microsoft Software License Terms allow. If you purchased Office or Microsoft 365 with a product key, you can enter it on one of the websites listed on the Microsoft Support page to download and install the software. However, if you bought a new Windows PC with Office pre-installed, a digital product key is transmitted to your PC when you activate Windows, and you wont receive a printed product key.

If you need to reinstall Office or are experiencing issues with your product key, there are several options available to you. If you have a Microsoft account, it takes the place of your product key for many tasks, such as activating Microsoft 365 and reinstalling Microsoft 365. If you purchased a new and unused Office 365 product key card to renew a subscription or buy a trial, you can enter that product key if Office asks you to provide it.

If your Office product key doesnt work or has stopped working, you should contact the seller and request a refund. Its possible that the product key was stolen or fraudulently obtained and subsequently blocked for use. If you have a physical copy of Office, the product key is usually found in the packaging or on a card inside the box.

In summary, a product key is a unique identifier that confirms your license and gives you full access to the features and updates of Microsoft Office. If you purchased Office or Microsoft 365 with a product key, you can enter it on one of the websites listed on the Microsoft Support page to download and install the software. If you need to reinstall Office or are experiencing issues with your product key, there are several options available to you, including contacting the seller for a refund or using a specialized program to retrieve the key.