Notes: If you don't see the security key option, it's possible that your organization doesn't allow you to use this option for verification. In this case, you'll need to choose another method or contact your organization's help desk for more assistance. Before you can register a security key, you must have at least one additional security verification method registered.

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

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

如果您購買的 Office 或 Microsoft 365 隨附產品金鑰，您可以在下方列出適用於您產品的網站上輸入產品金鑰。 輸入金鑰之後，您可以下載並安裝 Office，也可以為您的 Microsoft 365 訂閱續約。

Restore full use to Office after you get a notice to renew, activate, or update license.

Obtén información sobre los mandos personalizados de Xbox Design Lab y cómo puedes pedir uno según tus especificaciones.

How to change your product key to fix activation errors that can occur if you own and install multiple one-time purchases of Office..

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

Try these steps if you’re having trouble buying apps, games, or downloads from the Microsoft Store.

重要: 对 Office 2016 和 Office 2019 的支持已于 2025 年 10 月 14 日终止，并且不会有扩展安全更新。 所有 Office 2016 和 Office 2019 应用将继续正常运行。 但是，你可能将自己暴露在严重并且可能有害的安全风险之下。