According to Downdetector, Microsoft experienced large-scale cloud service outages early on November 13 Beijing time (Thursday U.S. Eastern time), affecting thousands of users across multiple regions. The disruptions impacted Microsoft 365 services and Outlook. Amazon Web Services (AWS) and Google also received user reports of service interruptions during the same period.
Microsoft said the outages were primarily concentrated in Exchange Online, caused by infrastructure servers unexpectedly becoming unavailable, which increased load on remaining infrastructure across multiple regions. The company noted it was investigating the incident.