SUMIFS function - Microsoft Support
How to use the SUMIFS function in Excel, one of Excel’s math and trig functions, to add arguments that meet multiple criteria.
Applies To:
Excel for Microsoft 365, Excel for Microsoft 365 for Mac, Excel for the web, Excel 2024, Excel 2024 for Mac, Excel 2021, Excel 2021 for Mac, Excel 2019, Excel 2016, Excel Web App, Microsoft Office, Microsoft365.com
从 Outlook (外出) 发送自动答复 - Microsoft 支持
如何从 Outlook 发送外出自动答复（具体取决于你拥有的电子邮件帐户类型）。
Applies To:
Outlook for Microsoft 365, Outlook 2024, Outlook 2021, Outlook 2019, Outlook 2016, Office for business, Office 365 Small Business, Outlook on the web, Outlook.com, New Outlook for Windows, Outlook on the web for Exchange Server 2016, Outlook on the web for Exchange Server 2019
How to sign in to Hotmail - Microsoft Support
To get support in Outlook.com, click here or select Help on the menu bar and enter your query. If the self-help doesn't solve your problem, scroll down to Still need help? and select Yes. To contact us in Outlook.com, you'll need to sign in. If you can't sign in, click here. For other help with your Microsoft account and subscriptions, visit Account & Billing Help. To get help and troubleshoot ...
Applies To:
Outlook.com
Sign in to your account
Sign-in options Usage Guidelines URL: Privacy Policy URL: ...
在 Outlook 中使用数字 ID 保护邮件 - Microsoft 支持
对单个消息进行数字签名 在邮件的“ 选项” 选项卡上的“ 更多选项” 中，选择“ 对此邮件进行数字签名 ”。 如果没有看到“签名消息”按钮，则可能是没有配置数字 ID 来对消息进行数字签名，或者它对你来说不是活动的。 Compose消息，然后发送。
Applies To:
Outlook for Microsoft 365, Outlook 2024, Outlook 2021, Outlook 2019, Outlook 2016, Microsoft 365 Copilot app for Android, New Outlook for Windows
KB5014754：Windows 域控制器上基于证书的身份验证更改 - Microsoft 支持
示例 确认在 KDC 进行 Kerberos 协议身份验证时，对于初始身份验证的公钥加密 (PKINIT) ，不能接受相应的证书 安装 2022 年 5 月 10 日 Windows 更新后，不会使用新的 SID 扩展保护具有非Microsoft CA 部署的环境。
Set time, date, and time zone settings in Windows - Microsoft Support
How to set time, date, time zone, and daylight-saving time settings in Windows
If your mobile device won't connect to your console during setup
Learn how to fix issues connecting your phone to your console so you can set up your Xbox console.
October 14, 2025—KB5066835 (OS Builds 26200.6899 and 26100.6899 ...
Highlights This update addresses security issues for your Windows operating system. Improvements This security update contains fixes and quality improvements from KB5065789 (released September 29, 2025). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change ...
Windows Update: FAQ - Microsoft Support
Learn how to get the latest Windows updates. Find answers to FAQ about updating Windows to keep your PC up to date.