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Asif Mohammad Sovon
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Asif Mohammad Sovon @asif_mohammad_sovon

Meet Asif Mohammad Sovon, an IT Assistant in the Bangladesh Air Force and a tech writer for Fileion....

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Jun 17, 2025

Microsoft 365 Outage Hits Outlook, Teams, and Exchange Online Services

Microsoft 365 Outage Hits Outlook, Teams, and Exchange Online Services Fileion.Com
Microsoft 365 users in the U.S. and other Tier-1 countries experienced disruptions on June 17, 2025, as multiple core services suffered outages.
Users reported issues with Outlook (web and desktop), Microsoft Teams calendar, Exchange Online, and OneDrive. According to Microsoft’s access via web, desktop apps, REST, and Exchange ActiveSync was disrupted.
  • Initial reports The outage emerged early Tuesday, with many noticing interruptions since morning. DownDetector showed spikes in error reports around the same time.

Microsoft’s Investigation and Fix

Microsoft acknowledged the incident, pointing to a recent backend change that triggered retry request overloads on routing servers. Shortly after, the company began rolling out mitigations.
 
Engineers deployed fixes, restarted affected systems, and rerouted traffic. As of mid-afternoon, 60-90% of impacted services were restored.

Root Cause and Wider Scope

A newly deployed update caused excessive retry requests, which overwhelmed the routing infrastructure. Source systems had to be manually restarted to stabilize operations. Besides Teams and Exchange, services like OneDrive, Copilot, and SharePoint were also affected. However, Microsoft confirmed there were no widespread network health issues, indicating an internal failure, not internet-level problems.

What This Means for Users

Impact Area User Experience
Email & Calendar Delays, errors, failure to load items
Teams Calendar features and meeting access hit
Other Apps Copilot, SharePoint, OneDrive slowed
Impact varied from region to region, with North America showing high user complaint rates on DownDetector.

Timeline of the Outage

  • Morning: Users begin experiencing login errors and service disruptions.
  • Midday: Incident confirmed; fix rollout starts.
  • Afternoon: 90% restoration achieved; monitoring continues.
  • Evening: Full recovery expected, but Microsoft hasn’t confirmed a final resolution time.

Microsoft’s Response

A spokesperson told reporters:
“We’re investigating an issue impacting users attempting to access Exchange Online or functionality within Microsoft Teams calendar.”
Despite the disruption, there’s no evidence of data loss or security risk. Microsoft is now focused on restoring full service and reviewing update procedures to prevent similar issues.

What Users Should Do

  • Check the Microsoft 365 Admin Center for the latest status updates.
  • IT teams should track incidents on the dashboard.
  • For temporary email or calendar access, consider using mobile apps or alternative web interfaces

Final Thoughts

This outage highlights how sensitive cloud systems are to backend changes. For many businesses, even short service interruptions can disrupt workflows. Organizations relying on Microsoft 365 should remain alert and ready with failover plans for critical periods.
 
How did this outage affect your workday? Drop a comment below or follow us for live updates and insights on cloud service reliability!
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