Microsoft 365 Developer Blog
A platform for creating collaborative apps for hybrid work
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Copilot UX components are generally available: bring interactive experiences into Copilot
Copilot UX components are generally available with SPFx 1.24. Bring interactive dashboards, forms, and business actions directly into Microsoft Copilot, so peop...
Latest posts
Behind SPFx Dev Skills: testing what agents know and fixing what they miss
How much guidance does an AI coding agent actually need? See how we used evaluation data to target SPFx knowledge gaps, improving results without wasting tokens on what models already know.
SharePoint Framework (SPFx) roadmap update – August 2026
SPFx 1.24 Beta 3 is now available, React 18 support is coming in 1.24, and a new Copilot Components preview program opens for customers and partners.
Building Agents for Teams: Managing the noise of collaboration
Most of us are familiar with one-to-one agent chats: private, direct interactions where rules are relatively simple. With only you and the agent, each moment has clear intent. You can ask follow-up questions, pause, or restart without worrying about how each exchange affects anyone else. Collaboration in groups works differently. Every message competes for attention, and a reply that is helpful to one individual may interrupt five others. Effective collaboration is built on countless small social judgments and gestures: deciding when to respond or stay quiet, choosing how much to say, and using the conventions...
Announcing the preview of the Work IQ Developer Tools
Software is shifting from apps built for people to agents that can reason over context and act on someone's behalf. Microsoft 365 Copilot put that shift in front of hundreds of millions of users, and Work IQ gave agents a production-ready intelligence layer to build on. What's been missing is the path in between: getting from an idea to a production agent running in front of customers. Today we're announcing the developer preview of Work IQ Developer Tools (WIQD), the agentic experience for Microsoft 365 Copilot extensibility that takes any plugin (skills, connectors, declarative agents) from an empty folder t...
Build Once, Run Everywhere: Unified Manifest for Office Add-Ins now Generally Available
Unified manifest support for Word, Excel, PowerPoint, and Outlook makes it possible for developers to build a single app that works across Microsoft 365 apps, creating a more consistent experience for users and a simpler deployment model for IT admins.
Building Agents for Teams: Turning conversations into outcomes
The Microsoft Teams platform mission is to build the best collaborative platform in the world. We want to make it easy for developers to build agents that participate seamlessly in chats, channels, and meetings, helping teams turn ideas into action in real time. By bringing agents directly into the places where collaboration happens, we can help ensure work is completed in the moment rather than getting lost in a stream of conversation. Everything we build is designed to help developers create collaborative experiences that empower people and agents to work together more effectively. Today we're launching ...
SharePoint Copilot Apps Now in Public Preview: From Intent to Action in Microsoft 365 Copilot
SharePoint Copilot Apps are now in public preview, introducing a new way to bring guided, action-oriented business experiences into Microsoft 365 Copilot. By combining natural language reasoning with structured UX, validation, permissions, and deterministic operations, organizations can help users move from intent to trusted outcomes directly in the Copilot flow.
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 ...