Microsoft 365 Developer Blog
A developer platform for building collaborative apps for hybrid work
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From Innovation to Enterprise Trust with Microsoft Agent 365
Agent 365 serves as the control plane for agents, providing organizations with a centralized location to manage agent identity, policies, observability, and lif...
Latest posts
Ignite 2025: A Developer’s Guide to Building Agents for Microsoft 365
Ignite 2025 brought many innovations for developers building agents for Microsoft 365. From new capabilities in Declarative Agents and Custom Engine Agents to the introduction of Microsoft Agent 365, the platform now enables organizations to architect intelligent solutions that are secure, governable, and ready for enterprise scale. Whether you’re creating your first agent, adapting existing frameworks, or navigating a crowded AI landscape, Microsoft 365 empowers you to build agents that integrate deeply with enterprise systems, leverage the latest AI stacks, and meet the highest standards for security and gov...
Microsoft 365 Copilot APIs: What’s New and What’s Next
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 ways to generate answers that honor permissions and context. This Ignite 2025 roadmap update expands the Copilot API surface with new capabilities that make grounded AI more accessible, more reliable, and easier to integrate within the Microsoft 365 trust boundary. Ret...
Ignite 2025 – What’s new for Office Add-ins
Read about new and exciting features now available in the Office Add-ins ecosystem for Ignite 2025. Learn about platform updates, developer experience improvements, and store enhancements.
Microsoft Agent 365 Interoperability for Smart, Secure Productivity
Agent 365 Interoperability equips any agent with apps and data to simplify human-agent workflows.
Announcing the Microsoft Teams SDK (Formerly the Teams AI Library)
Discover the new and improved Teams SDK, designed to help developers create even more powerful agents for Microsoft Teams.
New developer resource page for Microsoft 365 interoperability and data portability
Microsoft is launching a centralized developer resource page that consolidates interoperability and data portability information, tools, and feedback channels to help partners and customers use Microsoft 365 more effectively.
SharePoint Framework (SPFx) roadmap update – October 2025
SPFx is powering the future of Microsoft 365. From AI-driven portals to seamless integrations across SharePoint, Teams and Viva, SPFx is driving innovation at scale. This blog series kicks off our journey into the next evolution—transparent, community-driven, and built for the AI era. Let’s shape what’s next, together.
Dev Proxy v1.3 with exporting to HAR, LLM usage tracking, and enhanced permissions analysis
Introducing Dev Proxy v1.3 with new plugins for inspecting and debugging API requests, along with enhanced permissions analysis and improved OpenAPI spec generation for complex testing scenarios.
Migrating from IDCRL authentication to modern authentication in SharePoint
In the next few months, Microsoft will be removing the legacy authentication protocol known as IDCRL (Identity Client Run Time Library) in SharePoint.