Microsoft 365 Developer Blog

A developer platform for building collaborative apps for hybrid work

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From Innovation to Enterprise Trust with Microsoft Agent 365
Nov 18, 2025
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From Innovation to Enterprise Trust with Microsoft Agent 365

Nirav Shah
Nirav Shah

Agent 365 serves as the control plane for agents, providing organizations with a centralized location to manage agent identity, policies, observability, and lif...

Microsoft 365 DeveloperMicrosoft 365 Copilot

Latest posts

Guidance for implementing partner offerings for Viva Connections with ACEs and custom APIs
Nov 16, 2021
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Guidance for implementing partner offerings for Viva Connections with ACEs and custom APIs

Vesa Juvonen
Vesa Juvonen

We are excited to announce new guidance on how to build Microsoft Viva Connections extensibility with Adaptive Card Extensions (ACEs), which are calling securely custom APIs hosted in the Azure Active Directory.

Announcing Teams JS SDK v2 in public preview: Extend Teams apps across Microsoft 365
Nov 15, 2021
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Announcing Teams JS SDK v2 in public preview: Extend Teams apps across Microsoft 365

Zakiullah Khan
Zakiullah Khan

We are excited to share Microsoft Teams JS SDK v2 is now in public preview, which unlocks the ability for developers to begin extending Microsoft Teams apps across Microsoft 365. Now, apps built for Teams not only run everywhere Teams runs, but also in more of the places users spend their time.

Breaking changes to attendance report in Microsoft Graph onlineMeeting API (beta)
Nov 10, 2021
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Breaking changes to attendance report in Microsoft Graph onlineMeeting API (beta)

Microsoft Graph team
Microsoft Graph team

Today, we’re announcing upcoming breaking changes for developers using the Microsoft Graph API to get online meeting attendance reports beginning November 19, 2021.

Create custom Excel data types with new JavaScript APIs
Nov 3, 2021
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Create custom Excel data types with new JavaScript APIs

Chris Gross
Chris Gross

We’re excited to announce new capabilities that let you programmatically create your own custom data types within Excel. This helps solve a key problem developers have today with requirements around metadata associated with cells.

Ignite 2021: Build apps for collaboration in a hybrid world
Nov 2, 2021
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Ignite 2021: Build apps for collaboration in a hybrid world

Ben Summers
Ben Summers

Welcome to Ignite 2021. This blog is a summary of the developer news for the Microsoft 365 platform in the new era of hybrid work. Learn what's new and be sure to read the entire thing to get it all!

Microsoft Graph @ Ignite 2021 
Nov 2, 2021
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Microsoft Graph @ Ignite 2021 

Microsoft Graph team
Microsoft Graph team

Today, at Ignite 2021, we are excited to share new capabilities added to Microsoft Graph that give developers and IT administrators just that - more collaboration, more integration, more security, and more data for organizational insights.

Announcing public preview of Azure Fluid Relay service @ Ignite 2021
Nov 2, 2021
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Announcing public preview of Azure Fluid Relay service @ Ignite 2021

Mathangi Chakrapani
Mathangi Chakrapani

Hybrid work is transforming the way we use applications to collaborate. Today, we are excited to announce the public preview availability of the Azure Fluid Relay service to help create vibrant collaborative experiences.

Microsoft 365 Developer Program launches new instant sandbox with Teams sample data pack
Nov 2, 2021
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Microsoft 365 Developer Program launches new instant sandbox with Teams sample data pack

Michael Aldridge
Michael Aldridge

New capabilities offers Teams and Microsoft 365 developers a turnkey developer environment in seconds! Join the Microsoft 365 Developer Program to get your new instant sandbox today!

What’s new in Office Add-ins at Ignite 2021
Nov 2, 2021
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What’s new in Office Add-ins at Ignite 2021

Office Add-ins team
Office Add-ins team

Welcome to Ignite 2021! We’re excited to share the latest Office Add-ins announcements with our developer community. These new features will help you create solutions to increase productivity in today’s modern hybrid environment.