surface laptop displaying an Outlook integrated add-in

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 actionable messages can increase productivity by allowing users to take quick actions from within their Inbox.

Get started with actionable messages

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.

Read Outlook add-ins overview

Connect to Outlook

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

Get started with Outlook REST APIs

What's new in Outlook development

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