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Windows 8.1 Update and Windows RT 8.1 Update (also known as KB 2919355) include improvements that make your favorite apps and settings easier to find and use, provide more familiar mouse and keyboard options, and update security and performance.Here’s what you need to know about installing this important update. Check to see if it’s already installed

若要在Windows 11电脑上使用移动应用，需要安装Amazon Appstore。 设置完成后，你将能够浏览和安装精选目录中的移动应用。

Add members to a shared channel. When creating a shared channel, the default setting is Share this channel with everyone on the team.. After you've chosen Shared channel as the channel type in the selection box, type the names of the people in your org you want to add to the channel and select from the list.

Skype help & learning. Limited emergency calling Skype is not a replacement for your telephone and has limited emergency calling capabilities depending on your country.

如果在使用消息时遇到问题，这些疑难解答提示可能会有所帮助。 将媒体添加到对话. 消息框下方有三个按钮，可帮助你在消息中插入内容。 表情符号按钮和 gif 按钮会打开一个菜单，你可以在其中快速搜索所需内容。

Devices running Windows 11 version 22H2 and older. If you're running Windows 11 version 22H2 and older, Windows 10, Windows 8.1, Windows 7 or any other earlier OS version, your device will not be affected by the MSDT Troubleshooter retirement.

Updated Files On-Demand settings on Windows.We are updating the OneDrive sync app advanced settings for Files On-Demand for users who have the feature enabled.

Microsoft.com Worldwide. Microsoft.com is available in a variety of countries/regions. Choose your language preference below.

Why some files won't open in Internet Explorer. Internet Explorer uses add-ons such as Adobe Reader to view some files in the browser. If a file that needs an add-on won't open, you might have an older version of the add-on, which needs to be updated.