View a presentation without PowerPoint - Microsoft Support
Explore subscription benefits, browse training courses, learn how to secure your device, and more.
Applies To:
PowerPoint for Microsoft 365, PowerPoint for the web, PowerPoint 2021, PowerPoint 2019, PowerPoint 2016, PowerPoint Mobile
Write a letter in Word for the web - Microsoft Support
Learn how to type a letter online using Word for the web. Choose a letter template for online letter writing. Edit, send or print your letter online.
Applies To:
Word for the web
Multiply and divide numbers in Excel - Microsoft Support
Create a simple formula to multiply and divide in an Excel spreadsheet. You can multiply two or more numbers in one cell or multiply and divide numbers using cell references. All formulas in Excel begin with an equal sign (=).
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
Add or remove a digital signature for Microsoft 365 files
Learn how to use digital signatures, digital IDs, and signature lines in Microsoft 365 files, such as Word, Excel, and PowerPoint.
Applies To:
Excel for Microsoft 365, Word for Microsoft 365, PowerPoint for Microsoft 365, Excel 2021, Word 2021, PowerPoint 2021, Excel 2019, Word 2019, PowerPoint 2019, Excel 2016, Word 2016, PowerPoint 2016
如何安装最新版本的 DirectX - Microsoft 支持
本文介绍如何获取最新版本的 DirectX 以启用系统上的游戏和多媒体应用程序。
Manually add an account to the Microsoft Authenticator app
If your camera is unable to capture the QR code, you can manually add your account information to the Microsoft Authenticator app for two-factor verification.
Change your profile picture in Microsoft Teams
To change your profile picture in Microsoft Teams, click your existing profile picture and select the camera icon.
Applies To:
Microsoft Teams
激活 Office - Microsoft 支持
解决激活错误. 如果 Microsoft 365 无法激活，其最后会变为未授权，且 Microsoft 365 的所有编辑功能都会被禁用。 Microsoft 可能由于多种原因变为未授权。
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
How to check if your email address is a Microsoft account
How to access your Microsoft account? If you have confirmed that your email is a Microsoft account, you can access it by following these steps:
Applies To:
Microsoft account dashboard
UNIQUE function - Microsoft Support
Learn about the UNIQUE function, which returns a list of unique values in a list or range. UNIQUE is in a class of functions called dynamic arrays.
Applies To:
Excel for Microsoft 365, Excel for Microsoft 365 for Mac, Excel for the web, Excel 2021, Excel 2021 for Mac, Excel for iPad, Excel for iPhone, Excel for Android tablets, Excel for Android phones