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  1. Activate Windows - Microsoft Support

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

  2. Product activation for Windows – online & support telephone …

    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 …

  3. Find your Windows product key - Microsoft Support

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

  4. Activate Office for Windows - Microsoft Support

    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.

  5. Get help with Windows activation errors - Microsoft Support

    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 …

  6. Using the Windows Activation troubleshooter - Microsoft Support

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

  7. Activar Windows - Soporte técnico de Microsoft

    Obtenga información sobre cómo activar Windows con una clave de producto o una licencia digital, comprobar el estado de activación y vincular su cuenta de Microsoft.

  8. Reactivating Windows after a hardware change - Microsoft Support

    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.

  9. Difference between product key and activation code

    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 …

  10. Windows 11, version 25H2 update history - Microsoft Support

    Oct 20, 2025 · Known issues in this update For the most up-to-date information about known issues for Windows 11, version 25H2, go to the Windows release health dashboard.