How does multifactor authentication work? Let's say you're going to sign into your Microsoft account or work or school account, and you enter your username and password.If that's all you need then anybody who knows your username and password can sign in as you from anywhere in the world!

向组添加来宾. 当你将来宾（也称为外部用户）添加到组时，即向其授予了访问组中所有信息的权限。 这包括电子邮件、日历、项目备注、项目文件和项目计划。

Find out how to use Game Bar to capture game play, chat with friends, track achievements, and more.

Learn about cloud gaming on Xbox using your Android, iOS, or Windows device.

Training: Switch to SharePoint Online from Google Sites and start working together with these quick instructions on how to access, upload, and share the content, information, and apps your team relies on with SharePoint Online.

当在新设备中首次启动 Windows 10 时，设备上已安装的防病毒保护程序即是你的默认安全应用。但是，Windows 安全中心已预安装并可随时使用。

Near the upper right corner of the message list, select Filter > Unread. Tip: The name of the filter button changes to Unread to indicate which filter is applied. When you want to remove the filter so that you can see all the messages in the current folder, simply click the Unread filter button.

@mention a tag in a channel. In a channel conversation, simply @mention a tag (type @ and the tag name) in your message and select the tag from the list.The tag will appear just like any @mention, and the people associated with the tag will be notified.

提示: 可以使用任何电话号码来请求安全代码。. 电话号码不需要与你的帐户关联。. 手机不需要是智能手机，也不需要连接互联网，只需要能够接收短信。. 你可能需要创建新密码。 阅读有关如何创建强密码的提示。. 如果看到“该 Microsoft 帐户不存在”错误消息，请使用 Microsoft 帐户登录帮助程序。

压缩 (压缩) 文件. 在任务栏上的搜索框中，键入“文件资源管理器”，然后从结果列表中选择它。右键单击想要压缩的文件，然后依次选择“发送到”>“压缩文件夹”。 解压缩文件. 打开文件资源管理器并找到压缩的文件夹。