1930BST / 1330 Pacific – The issues being experienced by Microsoft customers, using the Exchange online protection service have improved, and connectivity to/from their service has drastically improved.
The latest update from Microsoft states:
Current Status: We’ve completed the process of restarting services and are shifting traffic to a healthy portion of the infrastructure to reduce impact. In parallel, we’re reverting a recent update which may have caused the service to operate below the expected threshold.
User Impact: Users are experiencing delays when sending and receiving email messages. Affected users will receive Non-Delivery Reports (NDR) when sending email messages.
Scope of Impact: Customer reports indicate that many users will likely experience impact related to this event. Our analysis indicates that impact is specific to a subset of users who are served through the affected infrastructure.
Start Time: Thursday, June 30, 2016, at 2:30 PM UTC
Preliminary Root Cause: The infrastructure responsible for processing Exchange Online Protection (EOP) message filtering became degraded.
Next Update by: Thursday, June 30, 2016, at 7:00 PM UTC