Reach hundreds of millions of users across web, Windows, Mac, and mobile.
Learn how actionable messages can increase productivity by allowing users to take quick actions from within their Inbox.
Help users get more done with add-ins. Launch your custom app as a taskpane, contextual card, or a simple button on the ribbon.
Bring Outlook-related data & features for Office & Outlook.com users into your app using the Microsoft Graph REST API.
Learn from others.
Ask the developer community questions about your code.
Submit an idea on the Microsoft 365 Developer Platform ideas forum.
Use the outlook-web-addins tag for questions regarding Outlook add-ins.