Current Status: The investigation determined that the network resource utilization issue persists. A potential source of the issue is a networking configuration update. Engineers are in the process of reverting the configuration update and connecting affected systems to alternate capacity. User Experience: Affected users are intermittently unable to connect to the Exchange Online service when using multiple protocols including Outlook, Outlook Web App (OWA), Exchange ActiveSync (EAS), and Exchange Web Services (EWS). Customer Impact: A few customers are reporting that they are experiencing this issue. Incident Start Time: Sunday, April 19, 2015, at 10:15 PM UTC Preliminary Root Cause: High network resource utilization is causing Exchange Online mailbox systems to intermittently lose connectivity. The underlying root cause is being investigated. Next Update by: Monday, April 20, 2015, at 5:30 AM UTC