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
Messaging Extensions available on mobile devices for Microsoft Teams
Beginning on May 10th custom messaging extensions will be available on Microsoft Teams for iOS and Android.
MIME format support for Outlook mail and attachments in Microsoft Graph (preview)
Today we’re excited to announce the release of two highly requested APIs to the Microsoft Graph beta endpoint. These allow you to retrieve the contents of an email message in MIME format and to download file, item attachments in their raw format.
[Outlook add-ins] Check certificate if mailbox.getCallbackTokenAsync starts returning “An internal error has occurred”
Renewing your SSL certificate may help you resolve "An internal error has occurred" errors returned by mailbox.getCallbackTokenAsync.
Microsoft Teams Platform Enhancements for Build 2019
Microsoft Teams at Build 2019 by Bill Bliss
Build 2019: Microsoft Graph powers the Microsoft 365 platform
Check out all the latest Microsoft Graph news from Build 2019
Microsoft Authentication Libraries for .NET and JavaScript are now Generally Available!
I'm happy to announce that Microsoft Authentication Libraries (MSAL) for .NET and JavaScript are now Generally Available! MSAL makes it easy for your application to sign in users and get access tokens to securely call protected APIs - from your own APIs to Microsoft Graph. MSAL enables secure access to data for any Microsoft identity – from personal Microsoft accounts to work or school accounts provided by Azure Active Directory.
New App registrations experience is now generally available!
The new app registrations experience in the Azure Portal is now generally available worldwide and in national clouds! Last November we kicked off the public preview for this experience and since then we’ve seen a number of organization and developers using the new experience and have been working hard to polish it.
The Microsoft Identity platform is OpenID Connect certified!
Azure AD and personal Microsoft accounts come together under a single standards-compliant protocol – OpenID Connect.
Office Extensibility: Build 2019
As thousands of developers arrive in Seattle for the Microsoft Build conference, we’re excited to share with the community what we’ve been working on in Office Extensibility. We’ll also be sharing news about Microsoft 365, Microsoft Graph, and Microsoft Teams in separate blog posts.