Equation Editor - Microsoft Support
Equation Editor (Microsoft Equation 3.0) was included in earlier versions of Word, but was removed from all versions in the January 2018 Public Update (PU) and replaced with a new equation editor.
Applies To:
Excel 2016, Word 2016, Outlook 2016, PowerPoint 2016, Excel 2013, Word 2013, Outlook 2013, PowerPoint 2013, Excel 2010, Word 2010, Outlook 2010, PowerPoint 2010, Excel 2007, Word 2007, Outlook 2007, PowerPoint 2007
App & browser control in Windows Security - Microsoft Support
Learn how to protect your device with Windows Defender SmartScreen and other app and browser control settings in Windows Security.
如何更正 VLOOKUP 函数中的 #N/A 错误 - Microsoft 支持
问题：查阅值不在 table_array 参数的第一列中。. VLOOKUP 的一个约束是它只能在表数组中最左侧的列中查找值。 如果查找值不在数组的第一列中，就会显示 #N/A 错误。
Applies To:
Excel for Microsoft 365, Excel for Microsoft 365 for Mac, Excel for the web, Excel 2021, Excel 2021 for Mac, Excel 2019, Excel 2019 for Mac, Excel 2016, Excel for Windows Phone 10
Microsoft Support
Microsoft support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows, Surface, and more.
Family & online safety | Xbox Support
Learn about Xbox online safety so you can manage your family's accounts.
发送电子邮件时，我收到 550、553 或中继禁止的错误 - Microsoft 支持
症状. 当你离开家并使用家庭电子邮件帐户发送电子邮件时，你的电子邮件可能会返回并显示 550、553 或中继禁止的错误消息。
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook 2013
在单元格中插入当前日期和时间 - Microsoft 支持
你可以在 Excel 单元格中将当前日期和时间作为静态值或动态值插入。 静态值是重新计算或打开工作表时不会更改的值。 动态值是每次重新计算公式时会更新的值。
Applies To:
Excel for Microsoft 365, Excel for Microsoft 365 for Mac, Excel for the web, Excel 2021, Excel 2021 for Mac, Excel 2019, Excel 2019 for Mac, Excel 2016
修复 Windows 中的打印机连接和打印问题 - Microsoft 支持
重新安装打印机. 如果打印机已打开并连接到网络，Windows 应该能够轻松地找到它。 可用打印机可以包含网络上的所有打印机，如蓝牙和无线打印机，或者插入另一台计算机和在网络上共享的打印机。
Aide et apprentissage sur Microsoft Edge
Obtenez de l’aide et du support sur Microsoft Edge. Recherchez du contenu de support Microsoft Edge, des articles pratiques, des didacticiels et bien plus encore.
Mobile devices help & learning
Help for Microsoft mobile apps on Android and iOS devices. Find how-to articles and video tutorials for Samsung Galaxy and iPhone. Learn how to link your Microsoft 365 mobile apps, including Outlook, OneNote, and Your Phone.