A network-level disruption struck multiple Microsoft 365 services on Wednesday evening, knocking out or degrading access to Exchange Online, Microsoft Teams, and the broader Microsoft 365 suite for users across affected regions.

The incident, tracked under issue ID MO1274150, began at approximately 8:37 PM IST (3:07 PM UTC) on April 8, 2026, and prompted Microsoft’s engineering teams to launch an immediate investigation.

Microsoft confirmed the outage was caused by a network-level disruption rather than an application or configuration fault, pointing to infrastructure-layer failures as the root cause.

The company’s internal telemetry flagged the degradation shortly after onset, and customer-reported complaints began flowing in within minutes of the start time.

We're investigating an issue that's affecting multiple Microsoft 365 services. We're reviewing available data and will provide additional updates to MO1274150 in the admin center.
— Microsoft 365 Status (@MSFT365Status) April 8, 2026

The affected services, Exchange Online, Microsoft Teams, and the Microsoft 365 suite, are among the most business-critical tools in enterprise environments globally. Any disruption to these platforms can cascade into halted communications, delayed workflows, and productivity losses across organizations of all sizes.

Microsoft moved quickly once the disruption was identified. By 9:01–9:02 PM IST, the company reported that its automated recovery mechanisms had already triggered and begun restoring service.

Internal telemetry and customer reports both indicated rapid improvement in service health during this window.

By 9:07 PM IST, just 30 minutes after the disruption began, Microsoft confirmed it had identified and corrected the underlying network issue. However, the company cautioned that residual effects were still possible.

Specifically, some users may experience brief email delivery delays as remediation actions continue to propagate across the Exchange Online infrastructure.

Microsoft classified the incident as a general Incident type, meaning the disruption had broad potential impact rather than being isolated to a specific feature or region.

The scope of affected users was not explicitly quantified, but given the global scale of Exchange Online and Teams deployments, enterprise users across time zones were likely impacted during the event window.

As of the latest update at 9:07 PM IST, Microsoft reported the incident as substantially mitigated, with corrective actions ongoing. Users experiencing lingering email delays were advised that these would resolve as the remediation rollout completed across all service nodes.

Microsoft has not yet published a preliminary root cause analysis (RCA), which is typically released within 48–72 hours of major incidents through the Microsoft 365 Admin Center.

Administrators are encouraged to monitor the Microsoft Service Health Dashboard under incident ID MO1274150 for further updates.

Follow us on Google News, LinkedIn, and X for daily cybersecurity updates. Contact us to feature your stories.

The post Microsoft 365 Network-Level Disruption Affecting Exchange Online, Teams, and Core Suite Services appeared first on Cyber Security News.