Microsoft 365 Developer Blog
A developer platform for building collaborative apps for hybrid work
Featured posts
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 ha...
Latest posts
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.
Deprecation of the previewImageUrl property for Insights items that reference file attachments
The previewImageUrl property is no longer returned for file attachment items.
Exciting new capabilities and enhancements for M365 Developer Program – October 2025
We are excited to share updates on the Microsoft 365 Developer Program with new capabilities and upcoming changes.
Changes to inline image representation in Outlook on the web and new Outlook for Windows
We are updating how inline images are represented in the HTML body of Outlook emails in Outlook on the web and the new Outlook for Windows. This change may impact how your add-in identifies and processes inline images when using the attachment ID.
SharePoint Framework (SPFx) roadmap update – September 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 new 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 v1.2 with mock response mirroring and improved performance
Introducing Dev Proxy v1.2 with mock response mirroring capabilities that make API simulation more realistic.
The new GitHub app for Teams: from conversation to code
Meet the reimagined GitHub app for Teams: an AI-powered app to collaborate with GitHub Copilot right inside your Teams conversations.
Excel announces undo support for 3rd-party web add-ins
Most user action performed by your Copilot extension or web add-in can now be undone using the familiar ribbon Undo button, keyboard shortcuts (Ctrl+Z), or the Undo button on Copilot response cards.