Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product. After you enter your key, you can …

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

Use your Microsoft account , not your product key, to install and activate Office and individually purchased Microsoft 365 apps, such as Project, Visio, Word, Excel, and Outlook.

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

Learn how to activate Office that is pre-installed on new Windows 10 PCs or using a new product key.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

In summary, a product key is used during installation, while an activation code is used to activate the software afterwards. Both are essential for ensuring a legitimate and functional software …

Many tasks for Office products don't require a product key because your Microsoft account takes care of them instead.

Get help with product key errors, or geographical region errors, when you redeem a new Office product key on Office.com/setup.