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Discover the latest features in Office 2021, including new ways to create content, manage data, and communicate effectively.

适用于: Office 2021, Office 2021 for Mac

Learn how to activate Microsoft Office 2010 online, by phone, or on a different or restored computer.

适用于: Picture Manager 2010, Word 2010, Outlook 2010, PowerPoint 2010, Project 2010, Project Standard 2010, Visio 2010, Visio 标准版 2010, Office 2010, InfoPath 2010, InfoPath 编辑模式 2010, SharePoint Workspace 2010

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.

适用于: Microsoft 365 专属 Excel, Microsoft 365 Mac 版专属 Excel, Excel 网页版, Excel 2021, Excel 2021 for Mac, Excel 2019, Excel 2019 for Mac, Excel 2016, SharePoint Foundation 2010, SharePoint Server 2010, Windows SharePoint Services 3.0

了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。通过检查管理员上方是否显示电子邮件地址，确认管理员帐户也是你的 Microsoft 帐户。如果显示了电子邮件地址，则这是 Microsoft 帐户。

Here are some answers to the frequently asked questions about the OneDrive desktop app for Windows.

Master the art of Excel formulas with our comprehensive guide. Learn how to perform calculations, manipulate cell contents, and test conditions with ease.

适用于: Microsoft 365 专属 Excel, Excel 2021, Excel 2019, Excel 2016

Accessing Credential Manager. Credential Manager lets you view and delete your saved credentials for signing in to websites, connected applications, and networks.

Learn how to change the size of the Start menu in Windows to show more of your apps, and even make it full-screen.

Miracast wireless displays. Wirelessly connect your PC to a TV, projector, another PC, or other kind of external display that supports Miracast.

获取有关如何在麦克风中设置和测试麦克风的Windows。在"声音设置"中，转到"输入"，在"测试麦克风"下，查找对着麦克风讲话时上升和下降的蓝色条形。