Microsoft Investigating Widespread Outlook.com Outage Preventing Users from Accessing Mailbox

01/10/2025

Microsoft is actively investigating and addressing widespread errors preventing users from accessing their mailboxes on Outlook.com.

The company has been providing regular updates throughout the day, indicating that targeted infrastructure restarts are gradually restoring service.

The issue, which began early on October 1, 2025, affects users attempting to log in or access their emails via the Outlook.com web interface.

While Microsoft has not detailed the full scope of the impact, user reports suggest a global outage, with many receiving error messages and being unable to view their inboxes.

The root cause has not been officially disclosed, but Microsoft’s response points towards a problem within the service’s underlying infrastructure.

We have received reports of an issue impacting mailbox connectivity for Consumer and Commercial users. We have determined the cause of the issue to be a degraded subset of service infrastructure. We have rerouted traffic and we’re monitoring the service to ensure resolution.…— Microsoft 365 Status (@MSFT365Status) October 1, 2025

Timeline of Microsoft’s Response

Microsoft’s support team has been working to resolve the issue, providing several updates on the service health status page.

Early in the morning, Microsoft acknowledged the problem and began its investigation. By 10:27 AM (GMT+5:30), the team was applying “smaller targeted reboots of affected infrastructure” and noted a gradual decrease in traffic errors as they monitored the service revert.

Updates around noon confirmed that engineers were continuing to “closely monitor service availability” and perform “additional targeted restarts where required.” These actions were aimed at stabilizing the platform and alleviating the impact on users.

By 1:07 PM (GMT+5:30), Microsoft reported observing “improvements in service availability following our targeted restarts.” The focus shifted to monitoring the service to ensure a full and stable recovery.

The most recent update at 2:33 PM (GMT+5:30) indicated that the team is continuing to see “steady improvements in service availability.”

Furthermore, Microsoft noted that the “backlog of messages is progressing as expected,” suggesting that email delivery delays that occurred during the outage are also being resolved.

Since reverting the configuration change, we’ve observed a steady improvement in service availability. We’re continuing to closely monitor the service to ensure impact is fully alleviated. More details can be found in the Service Health Dashboard under EX1162980 or…— Microsoft 365 Status (@MSFT365Status) October 1, 2025

While service appears to be returning to normal for many, Microsoft continues to monitor the situation closely to prevent any recurrence and ensure all systems are fully operational.

Users still experiencing issues are advised to check the official Microsoft 365 service status page for the latest information.

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Source: cybersecuritynews.com

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