Microsoft has mitigated a major Exchange Online outage that disrupted email and calendar access for customers worldwide.
The incident began Thursday morning and lasted nearly 16 hours, blocking users from logging into Outlook, Teams, and Hotmail.
Initially believed to be limited to North America, Microsoft later confirmed that the outage affected customers globally. Users also reported delays in email delivery alongside mailbox connection failures.
The company said the disruption was linked to unexpectedly high resource utilization caused by a recurring issue in a specific software build. This led to repeated database dismounts and failovers, driving up CPU usage and creating message queue backlogs.
Microsoft implemented configuration changes across the impacted infrastructure and, by early Friday, announced that services had returned to “optimal levels.” The company is continuing to monitor performance to ensure stability.
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