Learn how to view, install, and change settings for add-ins that enhance Microsoft 365 programs with custom commands and features. Find out how to troubleshoot add-in issues, cancel subscriptions, and access add-in help.

Learn how to install, use, and delete add-ins in Outlook for Microsoft 365, Outlook 2021, Outlook 2019, and Outlook on the web. Find out how to access add-ins from the store, custom files, or IT admin, and where to use them in messages, appointments, or meetings.

Learn what add-ins are and how they can enhance Excel's functionality. Find out how to install, activate, or uninstall add-ins from different sources and locations.

Learn how to get and use add-ins in Outlook.com, programs or utilities that help you automate tasks in your inbox. Find answers to frequently asked questions, ratings, reviews, and support options for add-ins.

Learn how the new Outlook for Windows differs from the classic Outlook in terms of features, design, and functionality. Compare the availability, support, and roadmap of various Outlook versions and modules.

Learn how to import your settings and install your existing Outlook for Windows add-ins when you switch to new Outlook for Windows. See the list of settings and add-ins that are imported or installed, and how to manage them.

Learn how to enhance your Windows Media Player with plug-ins or add-ons that add features such as DVD playback, audio effects, and more. Find links to download and install various options for different Windows versions.

Learn how to fix the Teams Meeting add-in that lets you schedule a Teams meeting from Outlook. Follow the automated or manual steps to check the installation, restart the apps, or enable the add-in.

If you updated to New Teams and lost the Teams Meeting button in Outlook Desktop, you can uninstall and reinstall the add-in. Follow the steps in this Microsoft Support article to resolve the issue.

加载项为 Microsoft Excel 提供可选的命令和功能。 默认情况下，加载项在 Excel 中不立即可用，因此在某些情况下，必须首先安装和 激活这些加载项，以便您可以使用它们。 某些加载项内置于 Excel 中，例如规划求解和分析工具库。 其他一些加载项可从下载中心获取，必须先下载并安装。