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Build powerful Outlook apps using one set of APIs

Reach hundreds of millions of users across web, Windows, Mac, and mobile.

Interactive emails

Learn how Adaptive Cards can increase productivity by allowing users to take quick actions from within their Inbox.

Extend Outlook

Help users get more done with add-ins. Launch your custom app as a taskpane, contextual card, or a simple button on the ribbon.

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Connect to Outlook

Bring Outlook-related data & features for Office 365 & Outlook.com users into your app using the Microsoft Graph REST API.

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What's new in Outlook development

Use Outlook event-based activation to encrypt attachments, process meeting request attendees and react to appointment date/time changes

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Consuming Graph Services using SSO and CORS from event-based Outlook add-ins

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Outlook add-ins and Outlook REST V2 decommission

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Outlook add-ins developer community

Microsoft 365 dev community

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Microsoft Q&A forum

Ask the developer community questions about your code.

Feature suggestions

Submit an idea on the Microsoft 365 Developer Platform ideas forum.

Stack Overflow

Use the outlook-web-addins tag for questions regarding Outlook add-ins.