The service disruption originated in Exchange Online, preventing users from logging into their email accounts through various connection methods. As high workloads battered infrastructure components, the incident rippled into other critical applications, triggering tens of thousands of problem reports across Microsoft 365 and related platforms. Engineers began restoring capacity and evaluating whether data streams could be shifted to alternative systems to alleviate the pressure. Although traffic spikes caused the requests to fail, Microsoft has not yet determined the definitive root cause.
Key points
Microsoft is actively assessing whether network traffic can be redirected to alternative…: Microsoft is actively assessing whether network traffic can be redirected to alternative systems to restore services.
Collateral impacts extended to other critical tools, including SharePoint Online, Microso…: Collateral impacts extended to other critical tools, including SharePoint Online, Microsoft Copilot 365, and Microsoft Defender XDR.
While unexpected infrastructure traffic surges caused mailbox requests to fail, the incid…: While unexpected infrastructure traffic surges caused mailbox requests to fail, the incident's fundamental root cause remains undetermined.
Sources checked by our analysis pipeline: 1
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According to a statement issued by Microsoft, the company is investigating connectivity issues related to Exchange Online, which is responsible for powering the email service of Outlook.
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The tech giant confirmed on social media that users in the Americas were facing trouble accessing their email accounts using various connections.
"We're investigating reports of users experiencing issues accessing Exchange Online mailboxes through multiple connection methods in the Americas. More details can be found in the Microsoft 365 admin center under EX1550543," it wrote in a post on X.
The failure has gained considerable traction through the social media space and outage tracking websites, with people complaining about difficulties like failed logins and inaccessible email addresses.
As per an article in Reuters, over 130,000 instances of Outlook-related issues have been filed by 1:27 p.m. Eastern time.
The complaints have been made by people trying to access their professional and personal emails. Microsoft has also stated that the…
Multiple core enterprise services, including Outlook, Teams, and Copilot, suffered worldwide disruptions on Thursday due to unexpected server failures. The incident increased the load on the company's remaining infrastructure after systems failed automated health checks and dropped offline. Technicians restarted the affected servers and deployed configuration tests to restore normal operations across affected global regions.
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