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

Unified manifest support for Word, Excel, and PowerPoint now available for preview

The unified manifest is a key component of the Microsoft 365 ecosystem providing a single model for distributing and managing Teams apps, Outlook add-ins, as well as Copilot agents which work across Microsoft 365 apps.  We've released it for Outlook, and now it is available for Word, PowerPoint, and Excel.

Introducing the Microsoft Graph Export-Import APIs for Exchange in public preview

We are happy to announce the launch of Export-Import APIs in limited Public Preview (Beta), a set of Microsoft Graph APIs that empower applications to discover, export and import contents from Exchange Online mailboxes in full fidelity.

Dev Proxy v0.24 with improved generating OpenAPI specs


Try the latest version of Dev Proxy to simulate APIs and test your applications under real-world conditions

Automate app compliance with ACAT

Learn how you can define the compliance boundary for your Microsoft 365 application on Azure and AWS with the App Compliance Automation Tool (ACAT) for Microsoft 365.

Teams Toolkit for Visual Studio Code update – January 2025

We’re kicking off the new year with exciting updates to Teams Toolkit for Visual Studio Code including a refreshed user interface for getting started and more!

Announcing the Office Add-ins Development Kit GA

The Office Add-ins Development Kit for Visual Studio Code is now generally available! After months of public preview, we've gathered invaluable feedback from the community and improved the experience.

Preview the GitHub Copilot extension for Teams Toolkit

Introducing the GitHub Copilot for Teams Toolkit—your companion in Visual Studio Code, Visual Studio, and GitHub.

Compute scaling in Azure Fluid Relay

Explore the journey of identifying and fine-tuning the optimal Kubernetes autoscaling configuration for Azure Fluid Relay.

Boost your Microsoft 365 app performance: Introducing tree shaking in TeamsJS


With Microsoft Teams JavaScript client library (TeamsJS) version 2.31.0, we’re excited to make the TeamsJS library fully tree-shakable.