Update, 11:03 p.m. ET: Microsoft says it is still working on load balancing measures to fully resolve the issue. See details below.
Microsoft is investigating a widespread outage affecting several Business and Enterprise Microsoft 365 services, including Outlook. Here are the details.
Microsoft says the issue is partly resolved
Based on information available on Microsoft’s Status Page (which is seemingly also facing reliability issues), users “may be seeing degraded service functionality or be unable to access multiple Microsoft 365 services.”
The incident began around2:00 p.m. ET and was attributed to backend infrastructure issues:
A portion of dependent service infrastructure in the North America region isn’t processing traffic as expected.
In its lastest status update, Microsoft said that the affected infrastructure had been restored, but recovery was still in progress as traffic was redistributed across healthy systems:
While we’ve restored the affected infrastructure to a heathy state, further load balancing is required to mitigate persistent impact. We’ve identified and are implementing additional actions to direct requests and traffic to additional healthy sections of infrastructure to achieve withstanding recovery.
Initially, Microsoft noted that impacted features included, but were not limited to:
- Sending and receiving email through Exchange Online, including notification email from Microsoft Viva Engage as well as subscription email for Microsoft Fabric users. Users may be receiving a “451 4.3.2 temporary server issue” error message when attempting to send or receive email through Outlook.
- Collecting message traces in Exchange Online.
- Searching within SharePoint Online, Microsoft OneDrive, and/or Microsoft Teams.
- Accessing the service portals, including Microsoft Purview, Microsoft Defender XDR, and the Microsoft 365 admin center.
- Creating chats, meetings, teams, channels or adding members in Microsoft Teams. Additionally, some users may be intermittently unable to create breakout rooms or Microsoft Teams live events.
- Receiving presence or location information in Microsoft Teams.
- Existing or new meeting options for Facilitator in Teams may not be honored.
- Applying and managing sensitivity labels, interactive operations on reports, and artifacts with sensitivity labels in Microsoft Fabric.
- Print registration and printer jobs may fail in Universal Print.
- Microsoft ToDo users may experience synchronization issues, which can prevent tasks from updating across devices. Additionally, tasks created in Shared Lists may not appear for collaborators.
- Microsoft Defender for Cloud Apps users may be unable to view insights or view, create, or update OAuth enabled app policies. Reporting data may also appear blank, even though no error is shown.
In addition to the updates to its status page, Microsoft has also been posting updates on X. The company expects to publish its next status update at 6:00 p.m. ET:
We’ll keep monitoring the situation and update this post as it develops.
Update, 11:03 p.m. ET: Here is Microsoft’s latest update:
Current status: We’re continuing to see steady improvements in service availability for Exchange Online and Microsoft Teams and our broader recovery efforts remain actively underway. Engineers are further refining load balancing measures to accelerate recovery and are methodically addressing the remaining impacted services.
We do not yet consider this issue resolved and we remain committed to treating this issue with the highest urgency and priority. We understand how difficult it can be to operate without a confirmed estimated time to resolution. Please be assured that our teams are actively investigating and addressing the underlying causes of the impact, and we will share an estimated time for resolution as soon as one becomes available.
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