Showing results for May 2025 - Microsoft 365 Developer Blog

As part of the expanding capabilities for agents across Microsoft 365, Office Platform announces add-in actions for Copilot agents are available in preview. This blog is an overview of all the new capabilities across the platform: APIs, developer tools, and add-in distribution options—making it simpler to build new or iterate on JavaScript add-ins.

We’re excited to introduce the Agent Store — a centralized, curated marketplace that features agents built by Microsoft, trusted partners, and customers. The Agent Store offers a new, immersive experience within Microsoft 365 Copilot that enables users to browse, install, and try agents tailored to their needs.

Read how the Microsoft 365 Agents Toolkit, an evolution of Microsoft Teams Toolkit, is designed to help developers build agents and apps for Microsoft 365 Copilot, Microsoft Teams, and Microsoft 365.

Learn how Microsoft 365 Copilot APIs allow you to build solutions grounded in your organization’s content, context, and permissions, without needing to relocate or duplicate data.

We are less than 18 months away from the retirement of Exchange Web Services. Start planning your migration from EWS to Microsoft Graph.

Get started with Nested App Authentication, a modern protocol for simplifying authentication for Personal Tab Teams apps that run across Microsoft 365.

Discover the new and improved Teams AI Library, designed to help developers create even more powerful agents for Microsoft Teams.