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  1. 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.

  2. 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.

  3. Product keys for Windows - Microsoft Support

    A 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 License Terms allow.

  4. Reactivating Windows after a hardware change - Microsoft Support

    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 …

  5. Activate Office for Windows - Microsoft Support

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

  6. Using product keys with Microsoft 365 - Microsoft Support

    If you paid for a Microsoft 365 product to be included on your new Windows PC, a digital product key is transmitted to your PC when you activate Windows. You won't receive a printed product …

  7. Difference between product key and activation code - Microsoft …

    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 …

  8. Where to enter your Office product key - Microsoft Support

    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 …

  9. About Genuine Windows - Microsoft Support

    To fix the issue, you can properly activate Windows by reentering your original product key. For other issues, you may need to buy a genuine version of Windows.

  10. Find and install your Microsoft downloads from Microsoft Store

    To find your Windows product key, see Find your Windows product key. If you have a digital gift card that's good for a game or app, see Redeem a gift card or code to your Microsoft account.