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：

Use Excel to create a chart from scratch or with recommended charts. Learn how to add a trendline and customize your chart style.

Get started with Microsoft Teams (free). Explore your options, find out what’s new, browse help topics, and more.

Find app notifications from the taskbar in Windows 11, and in Windows 10, use quick actions to change settings quickly as well.

Explore the new and refreshed apps of Windows 11, from Photos to Microsoft Store. Watch the video and read tips to find tools to stay creative and productive, whether on your phone or on your PC.

If either of the categories above apply to you, use the following procedures to update your browser: Update once. In the browser, go to Settings and more > Help and feedback > About Microsoft Edge (edge://settings/help).. If the About page shows Microsoft Edge is up to date., you don't need to do anything.

Use the Block or Allow settings in Outlook Web App to help control unwanted and unsolicited email messages.

Microsoft Forms includes rich, real-time analytics that provide summary information as well as individual student results for quizzes, surveys, and other types of forms.

Learn how to block someone or add email addresses to the safe senders list in Outlook on the web.

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