We are happy to announce new Microsoft Graph endpoints for Microsoft Cloud for US Government. These new endpoints are specific to the US Government cloud and are segregated from the Microsoft worldwide cloud. They are fully compliant with US Government data classification levels such as DoD information impact level 4 and level 5.
For the latest information on throttling for Outlook-related resources in Microsoft Graph and the Outlook REST API, see https://docs.microsoft.com/graph/throttling.
We are in the process of deploying a change to the OutlooK REST API and Microsoft Graph that will expire subscriptions to Outlook-related resources (mail, calendar, contacts, tasks) automatically when certain security-related events occur.
Last year, we announced that on November 2018, we will stop supporting Basic Authentication in the Office 365 Outlook REST API v1.0 and this is a follow up announcement to reiterate that we will be decommissioning Basic Authentication in Outlook REST API v1.0 this month.