About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

There are several ways to archive messages in Outlook. The methods that you can use depend on the type of email accounts that you have set up in Outlook.

Learn how to turn on device encryption, or standard BitLocker encryption in Windows.

You can refer to the contents of cells in another workbook by creating an external reference formula. An external reference (also called a link) is a reference to a cell or range on a worksheet in another Excel workbook, or a reference to a defined name in another workbook.

In Windows 11 22H2, the default app used to host console windows has been changed to Windows Terminal. After the October 2022 update, Command Prompt, Windows PowerShell, and other console apps will appear inside an instance of Windows Terminal.

了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

If you need help with Outlook.com, you can read our self-help content, or get support via email.

With online threats getting more advanced day by day, it is important to prioritize the safety of your web browsing. Microsoft Edge offers several features and practices that can enhance your online security and protect your personal information.

Find out how to set up and manage your security info and verification codes for your Microsoft account, and troubleshoot common issues.

Learn how to unlock your Microsoft account and resolve 'account has been locked' error message.