Microsoft 365 Developer Blog
A developer platform for building collaborative apps for hybrid work
Latest posts
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.
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 lifecycle.Â
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.
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.