Change your Office product key - Microsoft Support
How to change your product key to fix activation errors that can occur if you own and install multiple one-time purchases of Office..
Applies To:
OneNote for Microsoft 365, Visio Plan 2, OneNote for Microsoft 365 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, Office 2021, OneNote 2021, Excel 2021 for Mac, OneNote 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, Office 2019, Excel 2019 for Mac, 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, Office 2016
Installer et utiliser un scanneur dans Windows 10 - Support Microsoft
Découvrez comment installer un scanneur et l’utiliser pour numériser des images et des documents dans Windows 10.
KB5034441: Windows Recovery Environment update for Windows 10, version ...
KB5034441: Windows Recovery Environment update for Windows 10, version 21H2 and 22H2: January 9, 2024
减小 Word 文档的文件大小 - Microsoft 支持
了解如何减小 Word 文档的大小。 在 “图像大小和质量”下，执行以下任一操作：. 选择 “放弃编辑数据”。此选项将删除用于在编辑后将图像还原到其原始状态的存储数据。
Applies To:
Word for Microsoft 365, Word 2021, Word 2019, Word 2016
Troubleshoot problems with Microsoft Authenticator
You can resolve problems with Microsoft Authenticator by checking the tips in this article and reviewing some of the known errors.
COUNT function - Microsoft Support
How to use the COUNT function in Excel to count the number of cells that contain numbers, and to count numbers within a list of arguments.
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
Convert numbers into words - Microsoft Support
Discover how to convert numbers into English words in an Excel spreadsheet using the SpellNumber sample function.
Applies To:
Excel for Microsoft 365, Excel 2021, Excel 2019, Excel 2016
错误：无法读取文件或无法打开演示文稿 - Microsoft 支持
如果你因为收到一条错误消息，指出 PowerPoint 无法读取文件或无法打开演示文稿，则可能是因为 Microsoft 365 出于安全原因阻止了该文件。
Applies To:
PowerPoint for Microsoft 365, PowerPoint 2021, PowerPoint 2019, PowerPoint 2016
IF function – nested formulas and avoiding pitfalls
Multiple IF functions can be nested together to allow for multiple criteria. The Excel IF function statement allows you to make a logical comparison between a value and what you expect by testing for a condition and returning a result if True or False.
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 Web App, Excel for Windows Phone 10
Set up an authenticator app as a two-step verification method
Note: If you receive a prompt asking whether to allow the app to access your camera (iOS) or to allow the app to take pictures and record video (Android). select Allow so the authenticator app can access your camera to take a picture of the QR code in the next step.If you don't allow the camera, you can still set up the authenticator app as described in Manually add an account to the app.