At Build 2025, we introduced the Microsoft 365 Copilot APIs to help developers bring grounded AI into their solutions without rebuilding indexes or compromising security. The response has been encouraging, and your feedback continues to guide the direction of the platform.   Customers are asking for deeper retrieval, better search, and simpler w...

Custom Engine Agents now generally available—build and integrate your own AI into the flow of work Microsoft 365 Copilot is redefining how people interact with AI—embedding it directly into the flow of work as the intuitive, natural interface for agents: the ‘UI for AI’ As Copilot becomes the interface for AI in the workplace, we’re seeing grow...

Discover how developers can now build enterprise-grade, scalable, multi-channel agents with code using the Microsoft 365 Agents SDK.

Dive into our key announcements from Build to discover new pathways to extend, customize, and amplify Copilot capabilities.

Get familiar with the latest features that can help you boost your app's visibility and engagement across Microsoft 365.

Create engaging and productive experiences for Outlook and Teams users leveraging the same code base and capabilities across both applications.

In this post, we answer the most common questions about using message extensions in Teams.

Beyond plugins for Microsoft 365 Copilot, we're opening doors for you to construct bespoke intelligent, conversational app experiences for your Teams users—your very own copilots.

Learn about our announcements in our special virtual event showcasing new capabilities for developers to extend Microsoft Teams apps across Microsoft 365.