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Find out how to set up and manage your security info and verification codes for your Microsoft account, and troubleshoot common issues.

Applies To: Microsoft account dashboard

Learn how to personalize a Windows lock screen with a background photo, slideshow, or app notifications.

获取 Microsoft Edge 的帮助和支持。查找 Microsoft Edge 支持内容、操作方法文章、教程等。

Download the offline installer for Internet Explorer 11 in your preferred language and system from Microsoft Support.

Internet Explorer 11 support ended on June 15, 2022. If any site you visit needs Internet Explorer 11, you can open it with Internet Explorer mode in Microsoft Edge.

Find answers to frequently asked questions about Office 2021 and Office LTSC for Windows and Mac on the official support page.

Applies To: Office 2021, Office 2021 for Mac

Windows 11 版本 23H2; 2024 年 7 月 9 日 - KB5040442（OS 内部版本 22621.3880 和 22631.3880） 2024 年 6 月 25 日 - KB5039302（OS 内部版本 22621.3810 和 22631.3810）预览

如何激活预安装在新 Windows 10 计算机上的 Office 或使用新的产品密钥。

Applies To: Excel for Microsoft 365, Word for Microsoft 365, Outlook for Microsoft 365, PowerPoint for Microsoft 365, Access for Microsoft 365, OneNote for Microsoft 365, Publisher for Microsoft 365, Visio Plan 2, Excel 2021, Word 2021, Outlook 2021, PowerPoint 2021, Access 2021, Project Standard 2021, Publisher 2021, Visio Professional 2021, Visio Standard 2021, Office 2021, OneNote 2021, Excel 2019, Word 2019, Outlook 2019, PowerPoint 2019, Access 2019, Project Standard 2019, Publisher 2019, Visio Professional 2019, Visio Standard 2019, Office 2019, Excel 2016, Word 2016, Outlook 2016, PowerPoint 2016, Access 2016, OneNote 2016, Publisher 2016, Office 2016, Microsoft 365 for home, Office for business, Office.com, Project for Office 365

你可以使用安装介质（U 盘或 DVD）来安装 Windows 的新副本、执行全新安装或重新安装 Windows。要创建安装介质，请转到软件下载网站，你可以在这里找到分步说明。在该网站上，你可以选择 Windows 版本，并使用 U 盘或 DVD 创建自己的安装介质。

如果你正在使用 Windows 电脑，并且想要在电脑设备上显示来自其他屏幕的应用程序和内容，则需考虑将设备屏幕镜像或投影到 ...