Throttling coming to Outlook API and Microsoft Graph

Update 12/4/17: Updated the post with the current limits. On April 21, we will be enabling throttling on the Outlook REST APIs (accessed via https://outlook.office.com/api or https://outlook.office365.com/api), and on the Outlook-related endpoints of the Microsoft Graph (accessed via https://graph.microsoft.com). We wanted to give developers some advanced warning to make sure you were prepared!