Current Status: Engineers have determined that a code issue has been introduced with a recent build update. The IMAP protocol is unable to automatically load data from Exchange Online databases. Engineers are currently implementing a fix in order to remediate end-user impact.
User Impact: Affected users are unable to receive emails when accessing Exchange Online through the Internet Message Access Protocol (IMAP). As a workaround, users may be able to access mail via the Outlook Web App (OWA).
Customer Impact: Analysis of incident scope indicates that a limited number of customers appear to be impacted by this event. However, those customers affected likely have a large number of users experiencing impact. Engineers have received a few isolated customer reports of this issue.
Incident Start Time: Monday, January 18, 2016, at 12:00 PM UTC
Estimated Restoration Time: By Friday, January 22, 2016, at 1:00 AM UTC
Preliminary Root Cause: As part of our efforts to improve service performance, an update was deployed to the affected infrastructure; however, the update caused a code issue that prevents the IMAP protocol from automatically loading data from Exchange Online databases.
Next Update by: Friday, January 22, 2016, at 2:00 AM UTC