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On 12/31/2026, we will begin restricting updates to sensitive properties on non-draft email messages (including subject, body, and recipients). Apps will need Mail-Advanced.ReadWrite (or .All / .Shared) with admin consent to continue modifying these fields. Review your current usage and update permissions now to avoid unexpected failures.

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.

Get started with Nested App Authentication, a modern protocol for simplifying authentication for Personal Tab Teams apps that run across Microsoft 365.

Discover how Adaptive Cards can transform your app with rich, interactive experiences that boost productivity and streamline workflows, in our new Adaptive Cards documentation hub.

Earlier this year, the Office Platform Team announced that Exchange Online legacy tokens are deprecated and will be turned off. This is part of Microsoft’s Secure Future Initiative (SFI) to give organizations the tools they need in the current threat landscape. We’ll begin turning off legacy tokens in February 2025. Publishers and developers are ac...

The Office Platform team has been busy working on improvements to the platform since we last reported. This blog covers the new features from the office-js team announced at Ignite 2024.

We are decommissioning the Outlook REST v2.0 and beta endpoints starting March 31, 2024.

Today, we’re announcing that entity-based contextual add-ins in Outlook will be deprecated in Q2 of 2024.

We’re announcing changes to how Office Add-ins and apps are installed, accessed, and sideloaded to Outlook for Windows and Outlook for Web.

We’re very excited to announce the public preview of Copilot extensibility and other updates about our features and capabilities from across the Microsoft 365 platform.