Learn how to manage extensions in Microsoft Edge, including adding, disabling, or removing them as needed.

Make the everyday easier with Windows 11. When there's a lot to do, Windows 11 helps you get it done. With intuitive navigation and new multitasking tools, it brings you the performance you want and the security you need.

了解如何在电脑上安装 Office 2013 或 Office for Mac 2011。

How to lock cells in Excel to protect your data. You can also unlock a range of cells and grant permissions to others to edit.

You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.

Learn how to use the privacy dashboard in your Microsoft account and manage your privacy settings for products you use.

Learn how to view your PC information on Windows with Microsoft Support's step-by-step guide.

Learn how to get Windows Media Player 12 for Windows 10, Windows 8.1, and Windows 7.

了解如何在 Windows 10 和 Windows 11 中添加用户帐户。 有了帐户之后，每个人都可拥有单独的文件、浏览器收藏夹和私人桌面。

If Office activation fails, you'll see Unlicensed Product or Non-commercial use / Unlicensed Product in the title bar of your Office apps, and most features of Office are disabled. To restore all features of Office, you'll need to fix the problem that's causing activation to fail.