Install a custom add-in from a file in new Outlook. In your preferred browser, go to Outlook on the web, and the Add-Ins for Outlook window will open. Note: Installing custom add-ins from an XML file is …

Feb 20, 2025 · In this guide, we will walk you through how to enable add-ins in Outlook, covering both Outlook Desktop App and New Outlook (Web and Desktop versions). Follow these easy steps to …

Log into Outlook on the Web or Outlook.com. Click on the gear near the top right. Look for the "Manage add-ins" link. If you can see this, add-ins are supported on your account. To check what type of …

Oct 10, 2025 · With user experience, speed, and security in mind, Microsoft is now phasing out support for COM add-ins in favour of a new, modern standard: Office web add-ins. This is to resolve issues …

Dec 10, 2025 · Develop Outlook add-ins for the new Outlook for Windows: This document has details on the supported and unsupported COM add-in scenarios in the web add-ins platform.

Nov 20, 2025 · But the above hyperlink appears to be "special knowledge" because in Outlook web UI, I was unable to find the steps to get to that window. Is it possible to open exactly that window without …

Add-ins in Outlook.com are programs or utilities that help you automate tasks when you view or create messages. NOTE: You will need to install add-ins within Outlook to be able to use them in your work …

Dec 17, 2025 · When you sideload an add-in, you're able to install the add-in without first putting it in an add-in catalog. This is useful when testing and developing your add-in because you can see how …

Jan 28, 2026 · Find out how to add, remove, enable, or disable add-ins in Outlook and fix common issues with Outlook add-ins in desktop and web versions.

Jun 25, 2025 · In recent years, Microsoft has shifted focus from older COM-based add-ins to Modern Office Add-ins, which leverage web technologies like HTML, CSS, and JavaScript. As of 2024, these …