查找 Windows 7 或 Windows 8.1 的产品密钥. 卸载或重新安装 Windows 7 或 Windows 8.1 时，通常需要产品密钥。 通常，如果购买的是实物 Windows 拷贝，产品密钥应该在标签上或者在 Windows 随附包装盒中的卡上。

Use the Block or Allow settings to help control unwanted and unsolicited email messages by creating and managing lists of email addresses and domains that you trust and those that you don’t. This article is for Outlook Web App, which is used by organizations that manage email servers running Exchange Server 2013 or 2010.

如果选中了“在我的档案中显示图标”复选框，但图标仍未显示，请注销出现问题的设备然后重新登录。在电脑上，可能还需要重新启动应用：启动任务管理器，选择正在运行的应用（Game Bar 或 Xbox 应用），选择结束任务，然后重新启动应用。

Contact Microsoft Support. What's new. Surface Pro; Surface Laptop; Surface Laptop Studio 2

Use Microsoft Teams to chat online with the people you interact with. Start all chats the same way: by selecting New chat at the top of your chat list.. Start a chat with another person

Examples To view your System Information, type: msinfo32 To create an .nfo file in the folder C:\Temp with a name of Test.nfo, type:. msinfo32 /nfo C:\TEMP\TEST.NFO To create a .txt file in the folder C:\Temp with a name of Test.txt, type:. msinfo32 /report C:\TEMP\TEST.TXT To view System Information from a remote computer with a UNC name of BIGSERVER, type:

If you have a good antivirus program installed, make sure it's up to date and then do a full scan of your system. If you don't have an antivirus app installed on your PC, Microsoft offers some solutions if you're running Windows 8.1 or Windows 10/11. If you're running Windows 8.1 or Windows 10/11, you already have Windows Defender.

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Create a list in minutes. Build and share lists to help you track issues, assets, routines, contacts, inventory, and more. Start the training

I can't join a Teams meeting. My camera isn't working. My microphone isn't working. My speaker isn't working. My audio quality is poor. Reduce background noise. My volume is too low. Turn off automatic video. Join a Teams meeting on an unsupported browser. Breakout rooms troubleshooting guide. Immersive spaces troubleshooting guide