Microsoft has released new build for Office Insiders on Mac looking for updates in the Slow Ring.
Version 16.38 (Build 20060702) is now live and available for download.
With the latest update, Microsoft is allowing developers to add actionable Messages (to take quick actions) within Outlook.
Developers can now embed actions in their emails or notifications, elevating user engagement with their services and increasing organizational productivity. You can access this feature in two ways through actionable messages via email and actionable messages via Office 365 Connectors.Microsoft
More information on the feature can be found here
Download Office for Mac