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Hundreds of customers have reported issues with Microsoft Outlook as Microsoft investigates a brand new Change On-line disruption affecting e-mail companies. Receiving messages is among the many largest reported issues.
Some customers are additionally reporting hassle accessing Outlook and Change On-line. Microsoft has not individually listed Outlook as an affected service, leaving the scope of the disruption unclear.
Microsoft Investigates Change On-line
Microsoft logged the incident as EX1464935 within the Microsoft 365 admin middle. It started at 9:23 p.m. IST on Aug. 31, 2026.
The incident adopted reviews of entry and mail-flow issues, with Microsoft confirming its investigation two minutes later. Engineers are inspecting Change On-line however haven’t recognized the underlying trigger.
The most recent standing stays ‘Investigating,’ whereas Microsoft has not confirmed the total scope of the disruption. The corporate has not stated when the difficulty shall be resolved.
The advisory at present lists Change On-line as the only real affected service. The reported Outlook issues haven’t been formally described as a separate affected service.
Microsoft has confirmed that customers could expertise degraded performance throughout Change On-line. Reported signs embody delays or failures when sending or receiving e-mail messages.
Authentication-related errors have additionally been reported when accessing Change On-line companies. Customers have additionally skilled difficulties with mailbox operations and message-delivery workflows.
In line with outage-tracking service Downdetector, tens of hundreds of Change On-line customers have been affected. Reviews embody issues receiving e-mail via Outlook and accessing the Change On-line platform.
Directors can use the Service Well being Dashboard within the Microsoft 365 admin middle. It gives tenant-specific particulars that may assist organizations assess their very own service standing.
Change On-line Faces Contemporary Disruption
The present incident shouldn’t be the primary Change On-line drawback in current months. Earlier this 12 months, Microsoft investigated one other user-facing incident recognized as EX1454755.
Microsoft traced that earlier incident to a DNS-related fault inside a third-party e-mail supplier. The issue was not traced to Microsoft’s personal infrastructure.
In June, a separate mail-flow pipeline subject precipitated widespread supply delays. The disruption affected North America, Europe and Asia-Pacific.
Some messages remained undelivered for greater than an hour throughout that incident. These earlier issues don’t set up a trigger for the newest disruption.
Microsoft has not confirmed any connection between these incidents and the present investigation. Engineers are analyzing service telemetry and diagnostic knowledge to find out the supply of the newest drawback.
For organizations that depend on Change On-line for enterprise e-mail, delayed messages can create speedy issues. IT groups can test mail queues, supply reviews and connectivity standing.
These checks may also help organizations decide whether or not messages are delayed or lacking. They will additionally assist IT groups monitor the affect whereas Microsoft investigates.
For now, organizations ought to monitor the Microsoft 365 admin middle for additional data. They need to not assume that each one Microsoft 365 companies are affected.
The most recent reviews place e-mail supply and authentication issues on the middle of the disruption. Microsoft has not confirmed that Outlook itself is a individually affected service.
The investigation subsequently leaves two points unresolved: the reason for the disruption and its full scope. Microsoft has but to substantiate how broadly customers are being affected.
For customers unable to obtain messages, the shortage of a decision time provides uncertainty. Additional Microsoft updates ought to present extra details about the Change On-line disruption.
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