Outlook down today: What we know about Microsoft outage hitting email, Teams and 365 worldwide

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The disruption, which began on Thursday, has affected several Microsoft 365 applications like Microsoft Teams, Copilot and other workplace services. | World News

Microsoft's Outlook email service is facing a major global outage on Friday leaving users unable to access their inboxes, send or receive emails, and use several other Microsoft 365 applications. The disruption, which began on Thursday, has also affected Microsoft Teams, Copilot and other workplace services, disrupting businesses, government offices and educational institutions across multiple countries.

The outage appears to stem from a major infrastructure failure involving Microsoft's servers. The company has acknowledged problems with server stability and elevated workloads, but has yet to provide a complete technical explanation of what triggered the disruption.

Importantly, Microsoft has said it is not aware of any malicious activity causing the outage, indicating that there is currently no confirmed evidence of a cyberattack.

The disruption has affected users in several countries, with outage-tracking platform Downdetector recording reports from more than 70 countries. Outlook outage reports in the US peaked at around 138,000 before declining, although users continued to report problems accessing the service.

The disruption also affected businesses, government agencies, universities and other institutions dependent on Microsoft's cloud-based services.

The outage is linked to a server-side infrastructure problem involving Microsoft's Exchange Online platform, which powers Outlook's email services.

Microsoft's investigation found that a core process on affected servers was becoming overwhelmed. This caused the servers to stop responding to requests and eventually become unavailable.

The problem appears to have triggered a cascading infrastructure failure. As some servers became unavailable after failing automated health checks, the workload shifted to the remaining operational servers. This increased the pressure on the available infrastructure, contributing to further instability and connectivity problems.

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