Follow-up: Microsoft 365 Outage Enters a Second Day as Capacity Stays Below Baseline and Email Timeout Is Extended to 48 Hours
Microsoft's global Microsoft 365 outage entered a second day on November 13. In its official status updates that morning, Microsoft said recovery actions were progressing in phases across the affected infrastructure, with global telemetry and customer reports showing incremental improvement in several workloads, but service health remained variable and capacity had not yet fully returned to baseline.
The outage began on the afternoon of November 12, when Outlook mailboxes would not open and email-dependent features in Teams, Copilot and other services were disrupted. Reports for Outlook on Downdetector peaked at around 130,000 that afternoon. Microsoft is tracking the incident as EX1550543 for Exchange Online and MO1550821 for the wider Microsoft 365 suite.
Microsoft said it was continuing to prioritize queue and backlog processing to protect email during recovery, and had extended the email timeout window to 48 hours to preserve delayed messages. The company said it had no evidence of malicious activity associated with the incident.
Recovery has not been smooth. Microsoft said earlier on its official status account that servers returned to service could become unresponsive again once they received traffic, and that engineers were still analyzing diagnostic data to find the trigger. By around 6 a.m. Eastern on November 13, Outlook reports on Downdetector had fallen to about 15,000, and Microsoft said key scenarios including mailbox access and delayed email processing were improving, though some intermittent issues could continue.
GSM reported the outbreak of the outage and the first recovery steps on November 12; this is the latest status as of November 13. Microsoft has not announced a root cause and has promised a post-incident report once service is restored. (Source: Microsoft)
Source: Microsoft
Published by GSM · USA (original Chinese edition)
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