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SUMIF function - Microsoft Support
How to use the SUMIF function in Excel to add the values in a range that meet criteria that you specify.
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
Windows 登录选项和账户保护 - Microsoft 支持
Windows Hello. Windows Hello 可使你通过你的面部、虹膜、指纹或 PIN 登录到你的设备、应用、在线服务和网络。 即使你的 Windows 设备可以使用 Windows Hello 生物识别，也不必这么做。
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。
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
Insert or delete rows and columns - Microsoft Support
You can add columns, rows, or cells to an Excel worksheet or delete them. Columns insert to the left, rows above, and cells above or to the left.
Applies To:
Excel for Microsoft 365, Excel for the web, Excel 2021, Excel 2019, Excel 2016
Create a system restore point - Microsoft Support
Create a system restore point. Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.
See your favorites bar in Microsoft Edge and Internet Explorer 11
Get the steps for showing your favorites bar in Microsoft Edge and Internet Explorer 11.
Options for using Windows 11 with Mac® computers with Apple® M1®, M2 ...
32-bit Arm apps available from the Store in Windows are not supported by Mac computers with M1, M2, and M3 chips. 32-bit Arm apps are in the process of being deprecated for all Arm versions of Windows.
Microsoft Bing help - Microsoft Support
Explore subscription benefits, browse training courses, learn how to secure your device, and more.