Summary of this article
Microsoft 365 and Outlook faced widespread global disruptions.
Corporate tools, admin centers, and services were impacted.
Microsoft deployed traffic routing patches to restore services.
Tens of thousands of users were unable to access their emails on Thursday due to a service outage affecting Microsoft Outlook, Microsoft 365, and other applications of the company. The widespread disruption remained unresolved on Friday, while Microsoft is working to restore its services.
Although initial investigation reports indicated that the service disruption was confined mainly to the Americas, Microsoft later confirmed Microsoft users across all global regions could face connectivity issues.
In a post on X (formerly Twitter) on Thursday, the company initially reported, “We've confirmed related impact scenarios and have updated TM1550488. Our automated recovery features have taken action to restore service, and our telemetry indicates that these actions are effectively reducing impact.”
However, in a subsequent statement, Microsoft clarified that efforts are being made to limit the operational impact. It posted, “While we're working to mitigate impact, we've confirmed the issue may affect Microsoft 365 service connectivity for users in any region; more information will be provided in the Microsoft 365 admin center under EX1550543.”
Widespread Impact Across Microsoft Applications
The disruption has affected key Microsoft 365 platforms, including Outlook mailboxes, the Microsoft 365 admin center, and Microsoft Copilot. Users experienced significant difficulties in getting responses or loading chats across both web and desktop applications.
The list of tools and enterprise services that have been impacted includes Microsoft Planner, Microsoft To Do, Microsoft Defender, Microsoft Purview, Microsoft Graph, Microsoft Fabric, Power BI, SharePoint Online, Universal Print, Windows 365, and select Microsoft Intune services. Specific features, such as calendars, meeting scheduling, and chat creation within organisations using Information Barriers and Exchange Online, also suffered the outage.
Notably, Microsoft Teams features, which include joining calls, meetings, group chats, and channel messages, worked mostly normally.
This incident comes just weeks after disruptions were reported in its Azure cloud platform, which has affected commercial operations globally.
Technical Status Updates And Recovery
At 6:17 AM UTC on November 13, Microsoft released a service health report on its status cloud website providing details of the measures being taken to handle the outage. It read, “As part of our ongoing efforts to advance the recoverability of our frontend servers, we’re evaluating traffic controls that can be applied to increase capacity and stability. This includes traffic optimisation actions such as traffic throttling, protocol adjustments, and failover routing intended to improve stability in active regions. In parallel, we're expanding internal testing to track activity within a contained environment to improve traffic monitoring and issue detection capabilities.”
By 7:29 AM UTC, Microsoft noted positive indicators following infrastructure adjustments. The updated status read, “We’re seeing positive results for server stability after applying an upstream authentication/routing configuration component patch to a portion of our infrastructure. We’ll continue to monitor its progress and are working to expand it to servers supporting active regions coming online.”
The status reports negate any malicious activity as the cause of the outage. “As of now, we are not aware of any malicious activity that is causing this incident. We will continue to treat this incident with urgency and priority until full resolution. Once mitigated, we will provide full details of the root cause, defence-in-depth repair items, and more within a Post-Incident Report.”
Microsoft emphasised that it will continue monitoring the status until normal operations resume across regions.
