Microsoft 365 Developer Blog
A developer platform for building collaborative apps for hybrid work
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Going beyond text in Microsoft 365 Copilot – Introducing SharePoint Copilot Apps
Microsoft 365 Copilot is brilliant with words - but work isn't only words. Introducing SharePoint Copilot Apps: bring rich, interactive UX components straight i...
Latest posts
SharePoint Framework (SPFx) roadmap update – July 2026
June celebrates the announcement of upcoming SharePoint Copilot Apps, ships the quality-focused SPFx 1.23.2 release, and shares the roadmap for the AI era - shaped by your feedback.
Mailbox requirement set 1.16 now available for Outlook add-ins
Mailbox requirement set 1.16 is now generally available for Outlook add-ins. This release reflects our continued investment in closing the gap between COM/VSTO and web add-ins, with a focus on message and information security. Mailbox 1.16 introduces APIs and platform updates that enable your add-in to: Handle message decryption with ease Mailbox requirement set 1.16 introduces the OnMessageDecrypt event, which enables Outlook add-ins to automatically decrypt protected messages when a user opens them. The event-based workflow identifies encrypted messages, decrypts messages, displays ...
Remote Event Receivers are retiring: move to SharePoint webhooks before July 1, 2027
Remote Event Receivers in SharePoint Online are retiring. Starting July 1, 2027, all remote event receivers will stop firing events, including those registered using Microsoft Entra applications.
Going beyond text in Microsoft 365 Copilot – Introducing SharePoint Copilot Apps
Microsoft 365 Copilot is brilliant with words - but work isn't only words. Introducing SharePoint Copilot Apps: bring rich, interactive UX components straight into the Copilot canvas, built with any JavaScript stack your team already knows. Reuse your existing SPFx investments across Copilot, SharePoint, and Teams - no new platform, no infrastructure, no lock-in.
Migrating EWS notifications to Microsoft Graph
Migrating from the Exchange Web Services (EWS) notification framework, which supports push, pull, and streaming notification types — to the Microsoft Graph subscription model represents a fundamental transition toward a unified, stateless, and event-driven framework.
Agents League Hackathon 2026 – Enterprise Agents
From declarative agents for Microsoft 365 Copilot to fully autonomous multi-agent systems orchestrating complex workflows, developers now have the power to redefine how work gets done. If you're ready to push those boundaries, Agents League Hackathon 2026 is your stage. What is Agents League? Agents League is not just another hackathon—it's a global playground for developers, makers, and architects to experiment with: Whether you're building with pro-code tools (C#, TypeScript, SDKs) or leveraging low-code platforms like Copilot Studio, this is where innovation meets real-world im...
Work IQ: Production‑ready intelligence for every agent
Work IQ provides a workplace intelligence layer that enables agents to access and reason over organizational data, context, and tools, continuously building a semantic understanding across Microsoft 365 and external systems with built-in, permission-aware governance.
Build collaborative agents where work happens
At Microsoft Build 2026, we're announcing new investments to help your agents become teammates in everyday work, from new interaction patterns to streamlined tooling.
Frontier Tuning: Teaching AI to work the way you do
We're announcing the private preview of Frontier Tuning, a new approach to making AI work the way your business does by applying reinforcement learning inside your compliance boundary with your own data, processes, and conventions.