Sign in to Microsoft 365 | Microsoft Support
Learn how to sign in to Office or Microsoft 365 from a desktop application or your web browser.
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, Project Online Desktop Client, Publisher for Microsoft 365, Excel for Microsoft 365 for Mac, Word for Microsoft 365 for Mac, Outlook for Microsoft 365 for Mac, PowerPoint for Microsoft 365 for Mac, OneNote for Microsoft 365 for Mac, Excel 2024, Word 2024, Outlook 2024, PowerPoint 2024, Access 2024, OneNote 2024, Project Professional 2024, Project Standard 2024, Visio Professional 2024, Visio Standard 2024, Office 2024, Excel 2024 for Mac, Word 2024 for Mac, Outlook 2024 for Mac, PowerPoint 2024 for Mac, OneNote 2024 for Mac, Office 2024 for Mac, Excel 2021, Word 2021, Outlook 2021, PowerPoint 2021, Access 2021, Project Professional 2021, Project Standard 2021, Publisher 2021, Visio Professional 2021, Visio Standard 2021, Excel 2021 for Mac, Word 2021 for Mac, Outlook 2021 for Mac, PowerPoint 2021 for Mac, OneNote 2021 for Mac, Office 2021 for Mac, Excel 2019, Word 2019, Outlook 2019, PowerPoint 2019, Access 2019, Project Professional 2019, Project Standard 2019, Publisher 2019, Visio Professional 2019, Visio Standard 2019, Excel 2016, Word 2016, Outlook 2016, PowerPoint 2016, Access 2016, OneNote 2016, Project Professional 2016, Project Standard 2016, Publisher 2016, Visio Professional 2016, Visio Standard 2016, OneNote for Mac, Microsoft 365 for home, Office 365 Small Business, Microsoft 365 admin, Project Online, Microsoft 365 for Mac, Project for Office 365
查找你的 Windows 产品密钥 | Microsoft Support
了解如何查找用于激活的 Windows 产品密钥，以及何时改用数字许可证。
Applies To:
Microsoft account dashboard
Account & profile | XBOX Support
Find everything you need to manage your Microsoft account, XBOX profile, and more.
适用于电脑的游戏服务修复工具 | XBOX Support
如果在电脑上安装或更新游戏服务时遇到问题，或者你注意到电脑版 XBOX 应用启动时缺少内容，则可能需要下载并运行适用于电脑的游戏服务修复工具。
在 Windows 中个性化你的颜色 | Microsoft Support
摘要 更改设备上的颜色模式和主题色可以通过提供更个性化且更具视觉吸引力的界面来显著增强用户体验。 无论你喜欢浅色还是深色主题，或者想要向用户界面添加一些颜色，调整这些设置都很简单，只需几个步骤即可完成。 颜色模式 Windows 支持两种主要颜色模式：浅色和深色。 浅色模式提供 ...
Contact - Microsoft Support
Support for Windows 10 has ended on October 14, 2025. Learn more about your options for Windows 10.
在 Windows 中自定义桌面图标 | Microsoft Support
桌面是登录 Windows 时看到的第一个屏幕，保持桌面井然有序有助于提高工作效率和整体可用性。 本文介绍如何通过自定义默认桌面图标、添加用于快速访问的快捷方式、调整图标大小以匹配你的首选项以及根据需要显示或隐藏桌面图标来个性化你的 Windows 桌面，以保持干净、高效的工作区。 自定义 ...
Install Project | Microsoft Support
Project Online Professional or Project Online Premium: If you have a subscription to one of the cloud-based solutions of Project you won't see an option to install it unless you have an assigned license. If you're the Microsoft 365 admin responsible for assigning licenses, see Assign licenses to users.
Applies To:
Project Online Desktop Client, Project Professional 2024, Project Standard 2024, Project Professional 2021, Project Standard 2021, Project Professional 2019, Project Standard 2019, Project Professional 2016, Project Standard 2016, Office 365 Small Business
Download Microsoft Authenticator | Microsoft Support
The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.
Change the font size | Microsoft Support
Change the default font size, or customize font size for individual documents.
Applies To:
Excel for Microsoft 365, Word for Microsoft 365, PowerPoint for Microsoft 365, Excel 2024, PowerPoint 2024, Excel 2021, Word 2021, PowerPoint 2021