Learn how to locate your 25-character product key or digital license for Windows 10, Windows 11, Windows 8.1, or Windows 7. See where to find the product key on your device, box, or sticker, or how to contact the manufacturer if you've lost it.

Learn how to activate Windows 11 using a digital license or a product key. Find out how to check your activation status, link your Microsoft account, and troubleshoot activation issues.

Learn how to upgrade to Windows 11 from Windows 10 using Windows Update, Installation Assistant, or installation media. Note that some devices may not meet the minimum system requirements for Windows 11.

本网页介绍了如何在不同的设备和浏览器上使用 25 个字符的代码来购买或延长 Xbox 服务。还提供了视频说明、相关主题和联系方式，以及解决问题的辅助功能。

本文介紹如何在不同的裝置和瀏覽器上使用 25 個字元的代碼或禮品卡來購買 Xbox 或擴充 Xbox 訂閱。 提供影片指示和詳細步驟，以及常見問題的解答。

Learn how to install the featured update to Windows 10, version 22H2 by using an enablement package that activates the new features. This update is available for Windows 10, versions 2004, 20H2, 21H1, and 21H2 devices that receive updates from Windows Update.

Find out how to get help for your Microsoft 365 or Office product, depending on whether you have a subscription, a one-time purchase, or a work or school account. Compare the support options for chat, call back, and online resources for different products and versions.

Find self-help options and live chat with a Microsoft specialist for Microsoft 365, Office, Windows, Xbox, Surface devices and more. Sign in to get the right help and support for your product.

Learn how to fix errors while downloading and installing Windows updates with the Update Troubleshooter. Follow the steps to run the troubleshooter, restart your device, and check for new updates.

Learn how to identify and avoid fake Microsoft phone calls or pop-up windows that claim to offer PC or technical support. Report any scam attempts to Microsoft and help stop cybercriminals.