Erfahren Sie, wie Sie die neuesten Windows erhalten, damit Ihr Gerät reibungslos und sicher ausgeführt wird.

For more information about how to customize the ribbon, see Customize the ribbon in Office.. When custom groups show a green or blue ball on the Quick Access Toolbar. Icons represent custom groups of commands on the Quick Access Toolbar when an icon is chosen.

Add or edit hyperlinks to web sites, local files, email messages, or anchor points in your document.

How to add a signature to your Word documents. You can also use the Signature Line command in Word to insert a line to show where to sign a document.

How to track changes in Word using revision marks. Accept, reject, or hide changes made by others working in the file.

即使已开启其他防火墙，开启 Microsoft Defender 防火墙也很重要。 它保护你免遭未经授权的访问。 若要打开或关闭 Microsoft Defender 防火墙，请执行以下操作：

Warning: Excel provides the DATEDIF function in order to support older workbooks from Lotus 1-2-3.The DATEDIF function may calculate incorrect results under certain scenarios. Please see the known issues section of this article for further details.

Erfahren Sie mehr über die Wiederherstellungsoptionen in Windows. Erfahren Sie, wie Sie Ihren PC zurücksetzen, eine frühere Version von Windows wiederherstellen oder Windows über ein Medium erneut installieren.

Learn how to use Narrator, a screen-reading app built into Windows, with this complete guide and how-to articles.

Use data validation rules to control the type of data or the values that users enter into a cell. One example of validation is a drop-down list (also called a drop-down box or drop-down menu). Watch more in this video.