Get help with signing in, changing passwords, creating and sending mail, deleting mail, creating folders, and more in Outlook on the web.

Learn how to remove malware from your PC. Use Microsoft Defender Antivirus in Windows 10 or Windows 11 to scan your PC for malware, viruses, or other threats.

Learn about the recovery options in Windows. Find out how to reset your PC, go back to a previous version of Windows, or use media to reinstall Windows.

开始之前. 确保要安装 Windows 11 的设备满足最低系统要求。 如果设备当前正在运行 Windows 10，建议使用电脑健康状况检查应用验证最低系统要求。 我们不建议在不符合要求的设备上安装 Windows 11。

If you encounter issues while using messages, our troubleshooting tips may help. Adding media to your conversations. Below the message box are three buttons to help you insert content into your message.

Most tools and options in Microsoft Edge are available when you select Settings and more > Settings.

Learn how to get started with PowerPoint for the web from Office.com and create presentations online.

Having trouble connecting to your email from Outlook on your desktop? Follow these steps to let Outlook diagnose and fix errors in your Outlook mail profile that might be causing the issue.

Learn how to use and install mobile apps on your Windows 11 PC with the Windows Subsystem for Android™.

Try these solutions if you can't sign in to your Outlook.com, Hotmail, Live, or MSN email account, or you're not sure how to sign in or sign out.