- Microsoft 365 services are experiencing a multi-day outage, with significant progress reported on Monday but issues still unresolved as of Tuesday.
- On Monday around 8 a.m. PT, Downdetector reported a spike in Outlook problems, peaking at over 6,000 reports at 8:17 a.m.
- By Monday afternoon, Microsoft acknowledged the issue affecting Exchange Online and opened an incident investigation (EX1464935).
- By 10 p.m. ET on Monday, Microsoft reported that mail flow was improving, but search functionality remained degraded.
- On Tuesday at 3 a.m. ET, Microsoft reported improvements with search functionality.
- By Tuesday at 6 a.m. PT, Downdetector showed fewer than 550 reports, and Microsoft stated that 'service telemetry continues to indicate recovery'.
- However, by Tuesday at 1 p.m. PT, Outlook was still experiencing issues for some users.
- Microsoft Outlook faced significant disruptions due to problems with Microsoft Exchange Online, which is essential for mailbox access and email delivery.
- The outage affected not only Outlook but also other services, including SharePoint, Teams, and Microsoft 365 Admin Center, due to a misconfiguration issue.
- Microsoft's investigation revealed that the issue was related to a misconfiguration impacting authentication components.
Microsoft 365's outage has entered its second day, with ongoing issues affecting Outlook and other services due to a misconfiguration in authentication components.10
Microsoft reported that while service availability is improving, it has not yet declared a full resolution. The company stated, “Our mitigation actions are continuing to progress within the remaining affected infrastructure.”
Users have reported various issues, including email delays and degraded functionality, with 37% of users facing problems receiving messages and 23% struggling with the app. Downdetector noted a spike in reports, with over 130,000 user reports on Monday, significantly above the normal baseline.
By Tuesday morning, reports had decreased to fewer than 550, indicating some recovery. Microsoft acknowledged the disruption, stating, “We know this is disruptive for customers and we appreciate their patience while we work to restore services as quickly as possible.”
The outage has also impacted other Microsoft services, including SharePoint and Teams, attributed to the same authentication configuration issue. Microsoft is now in a period of extended monitoring to ensure a complete resolution.
As users await full service restoration, many are still experiencing slow performance and functionality issues, with reports of Outlook freezing and requiring multiple reloads.
“Just acting kind of slow here in Iowa,” one user reported, highlighting the ongoing frustrations faced by many.
Microsoft continues to provide updates on the situation as it develops.
“Downdetector logged over 130,000 user reports on Monday, roughly two orders of magnitude above baseline, with issues spread across receiving mail, sending mail, login, and the app. Microsoft attributes the problem to a core authentication configuration used by multiple services, including SharePoint, Teams, and Copilot.”
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