To activate Windows 10 using an internet connection: As Windows 10 will automatically activate if you are connected to the internet, you can confirm your activation status by selecting Start > Settings > Update & Security > Activation and looking under Windows.. If online activation fails, first try the activation troubleshooting in Activate Windows 10.

By setting up MFA, you add an extra layer of security to your Microsoft 365 account sign-in. For example, you first enter your password and, when prompted, you also type a dynamically generated verification code provided by an authenticator app or sent to your phone.

获取 Windows 操作系统的官方支持和帮助信息，以及如何使用 Windows 的指南。

Learn common SharePoint Online tasks with these videos and tutorials, and get links to more training for SharePoint and Office 365.

Occasionally, dates may become formatted and stored in cells as text. For example, you may have entered a date in a cell that was formatted as text, or the data might have been imported or pasted from an external data source as text.

注意: 如果你不在 Windows 设备上，可以通过转到“联系”Microsoft 支持部门 键入“排查 BSOD 错误”，在浏览器中运行“蓝屏疑难解答”。 然后按照“推荐的帮助”下的引导演练进行操作。

Training: Watch and learn how to create a PowerPoint presentation, add/format text, and add pictures, shapes, and/or charts.

Download information. The following files are available for download from the .NET Download site: Download the Microsoft .NET Framework 4.8 offline installer package now.

Note: If you selected Delete unread copies and replace with a new message, the original message opens for editing.When you select Send, the original email message will be deleted from the recipient’s mailbox and replaced with the newly edited one.

After you set up your security verification methods for your work or school account, you can update the related details. Using the Security info page