Throttling coming to Outlook API and Microsoft Graph

On April 21, we will be enabling throttling on the Outlook REST APIs (accessed via or, and on the Outlook-related endpoints of the Microsoft Graph (accessed via We wanted to give developers some advanced warning to make sure you were prepared!

Add ins are now available for all Outlook on Mac users

Add-ins bring your favorite apps right inside Outlook, so you can accomplish tasks quickly without needing to switch back and forth between email and other apps. Add-ins are a great way to increase usage of your apps by making them accessible directly within Outlook. Last year, we announced the rollout of add-ins to Outlook 2016…


Pinnable Taskpane in Outlook 2016

Have your add-in users been asking you for the ability to leave the add-in taskpane open in their mailbox as they switch between messages? At Ignite this year, we announced the addition of a new feature for Outlook add-ins, the Pinnable Taskpane. Today we are excited to announce this feature is now officially available in…


Add-in Commands in OWA and Outlook on the Mac

Add-ins are a great way to increase usage of your apps by making them accessible directly within Outlook. We previously announced add-in commands availability in Outlook desktop. Add-in commands have simplified the user interaction with add-ins while also making their presence more visible and engaging. We are pleased to announce the add-in commands feature is…


Update to Filtering and Sorting in the REST APIs

We recently deployed a breaking change to the Microsoft Graph V1.0 and the Outlook V1.0 & 2.0 endpoints to address a major issue with filtering. For full details, see

Actionable messages developer documentation now available

In September, we announced Actionable message for connectors and email in preview. We are excited to announce the preview is now available to all Office 365 users via Outlook on the web, including for your Inbox. Some of the top connectors such as Asana, Bitbucket, Github, Trello, Twitter, Wunderlist and Zendesk are already enabled with…

Introducing Request Validator to beta endpoint

I wanted to update you all on a breaking change that we are making to the Outlook REST API Beta endpoints.  This change is the introduction of a Request Validator which is going to be deployed worldwide over the next few weeks.  Here are the details of this change. What is the Request Validator? The…