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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.

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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

Extending Microsoft Teams apps to Outlook and Office.com

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Microsoft 365 Platform Community Call – 26th of April, 2022

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Office Add-ins community call – April 2022

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Get Excel workbooks using Microsoft Graph and MSAL in an Outlook Add-in

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

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Single Sign-on (SSO) sample Outlook add-in

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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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