Learn how to use the System File Checker tool (SFC.exe) to scan and restore missing or corrupted system files in Windows. Follow the steps to run the tool, view the details, and manually replace the corrupted files if needed.

Microsoft Authenticator is a mobile app that helps you sign in to all your accounts without using a password. Learn how to download, install and add your accounts to the app, and see also the notes and details for using it in China.

Learn how to check the technical details of an email message, such as who sent it, the software used, and the email servers. Find out how to copy, paste, and block spoofed senders using internet headers.

Learn the difference between IMAP and POP, two methods to access email from different devices. IMAP lets you read messages online without downloading them, while POP downloads them to your computer and deletes them from the server.

What's the file attachment size limit in Outlook.com? The attachment size limit for files is 25 MB. You can also share a file from OneDrive. This way, your recipients can receive larger files and collaborate on it in real time.

如果帐户上没有足够的身份验证方法来获取强身份验证令牌，则无法添加帐户。 Authenticator 中会显示一个错误，指出“若要设置Microsoft Authenticator，需要转到 Web 浏览器上的 aka.ms/mfasetup。 如果收到消息“你可能从受管理员限制的位置登录”，则表示管理员尚未为你启用此功能，并且可能设置了安全 ...

Learn how to export contacts from Outlook to a CSV file, Excel, PST, or iCloud. You can also import contacts from other email services like Gmail, Yahoo, or Thunderbird.

Tips: While signing in, select Yes at the "Stay signed in?" prompt if you want to go straight to your mailbox next time (not recommended for shared computers). Alternatively, check the "Don't show this again" box and select No to be prompted for your password each time.. If you can't sign in, or have forgotten your username or password, use our sign-in troubleshooter.

Download and install this update to fix issues with applications that use the Microsoft Foundation Classes (MFC) library of Visual C++ 2013 in high-DPI mode. The update is available for both x86 and x64 systems and supports multiple languages.

从屏幕右边缘滑入，然后点击“搜索”。 如果你使用的是鼠标，请指向屏幕右下角，然后单击“搜索”。在 “搜索 ”框中键入“命令提示符”，右键单击“ 命令提示符”，然后单击“ 以管理员身份运行”。如果系统提示你输入管理员密码或进行确认，则键入密码或单击“允许”。