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

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

However, if a product key is required, it can usually be found in the confirmation email you received after purchasing Windows, or in the box Windows came in. Microsoft doesn't keep a …

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

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

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

Look for key features of genuine Windows software, such as the Certificate of Authenticity (COA), a proof of license label, and an edge-to-edge hologram. For more information, visit the …

If you make significant hardware changes on your device, such as replacing your motherboard, Windows will no longer find a license that matches your device, and you’ll need to reactivate …

To locate your product key online, see Get your Workplace Discount Program product key. If you're using a volume license version of Office Professional Plus at work, you'll need to …

Find help and how-to articles for Windows operating systems. Get support for Windows and learn about installation, updates, privacy, security and more.