Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Learn how to use digital signatures, digital IDs, and signature lines in Microsoft 365 files, such as Word, Excel, and PowerPoint.

Erfahren Sie, wie Sie Microsoft 365 oder Office 2019 auf einem PC oder Mac installieren, erneut installieren, oder aktivieren.

Updates for Windows Server 2022. Windows Server 2022 is the latest release in our Long-Term Servicing Channel (LTSC). It builds on Windows Server 2019, our fastest adopted Windows Server ever.

你可以使用安装介质（U 盘或 DVD）来安装 Windows 的新副本、执行全新安装或重新安装 Windows。 要创建安装介质，请转到软件下载网站，你可以在这里找到分步说明。 在该网站上，你可以选择 Windows 版本，并使用 U 盘或 DVD 创建自己的安装介质。

Add a contact from someone's profile card. If you're using Outlook in an organization and you click someone's name or picture in Outlook or other Office apps and services, you might see a profile card with additional information.

Get answers to some basic questions about what two-step verification is, and how to set it up and use it to help keep your Microsoft account more secure.

There are several ways to calculate the difference between two times.

Set your document's page numbering to start on the second page, and choose another starting page number.

Share your calendar in an email. If you don't want to give someone permissions to share your calendar and see updates, you can email a static copy of your calendar for a specific date range.