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

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

You can also try our guided support in your browser to help with activation issues. I thought this device included Microsoft 365 or a non-subscription version of Office.

Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. There are three methods to which you can activate your …

Learn how to use the Activation troubleshooter to resolve common activation issues in Windows.

If activation fails, see What to try if you can't install or activate Microsoft 365 or Office for Mac. Installation notes for Microsoft 365 or Office 2024 on a Mac

If you're not activated, complete the activation process with the steps you see on the Activation page. If you experience an error while activating, see Get help with Windows activation errors.

In most cases, Office is activated once you start an application and after you agree to the License terms by selecting Accept. Office might activate automatically. However, depending on your product you …

Microsoft Support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.

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 experience.