Microsoft Outlook and Microsoft 365 Hit by Widespread Connectivity Fault
The company says elevated load made parts of its infrastructure unstable, prompting it to move connections across its global network to reduce access errors.
Overview
- Users began reporting access problems on Thursday afternoon, and monitoring site Downdetector recorded large spikes of complaints for Outlook and Microsoft 365 during the early evening reports.
- Microsoft confirmed the incident in public updates and posted incident identifiers EX1550543 and MO1550821 in the Microsoft 365 admin center for administrators to follow.
- The company’s investigation found elevated load on a portion of its infrastructure that likely contributed to connection failures across Exchange Online and related services.
- As an immediate mitigation, Microsoft has started redistributing connection traffic across its global network to rebalance demand while engineers continue to investigate the root cause.
- Multiple Microsoft services beyond Outlook — including Teams, OneDrive, Copilot, Microsoft Store, Microsoft Account and Azure — showed user reports of disruption and organizations are advised to monitor the admin center for status updates.