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

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 two methods to which you can activate your …

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

Troubleshoot activation errors If Microsoft 365 can't activate, it eventually becomes unlicensed and all editing features of Microsoft 365 are disabled. Microsoft can become unlicensed for a number of …

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. If you're unable to activate Windows 11, the Activation …

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. This article will help you troubleshoot and fix common …

The Product Activation Portal enables activation for a wide range of perpetual Microsoft products and supports both connected and non‑connected devices. This evolution ensures activation remains …

If you follow the transfer terms in the Software License Terms, you can move Office to a different computer, but you must activate it by phone and then uninstall Office from the original computer. If …

Find your product key to activate WindowsA product key is a 25-character code that's used to activate Windows and helps verify that Windows hasn't been used on more PCs than the Microsoft Software …

Learn how to prepare your Windows device for a hardware change and find help reactivating Windows after a hardware change is complete.