A product key is a unique code that activates Microsoft Office and allows you to use all of its features. You’ll need to purchase a product key if you want to install Office on a new computer or if you’ve lost or damaged your old one.
There are a few different ways to buy a product key for Microsoft Office. You can buy it directly from Microsoft, or you can buy it from a third-party retailer. If you buy it from Microsoft, you can be sure that you’re getting a genuine product key. However, you may be able to find a cheaper price if you buy it from a third-party retailer.