“We’re investigating an issue where users may be experiencing intermittent issues accessing https://t.co/ZUfyjth6sU,” stated Microsoft 365 Status early Tuesday.
On April 27, 2026, Microsoft Outlook and Hotmail services experienced widespread disruption. Users reported persistent login failures, being locked out of accounts despite entering correct credentials.
The outage affected both desktop and web versions of Outlook. Users experienced repeated password prompts and authentication errors—an authentication loop that left many frustrated.
Reports linked the issue to Microsoft’s identity verification infrastructure. Corporate users reported internal communication breakdowns due to the outage.
Many organizations initiated internal security checks fearing potential breaches. Microsoft officially recognized the mess, stating, “The disruption is part of a broader Outlook service outage impacting users more widely.”
Downdetector indicated that the problem was affecting numerous users across the United States and the United Kingdom. Experts suggest implementing contingency plans for backup communication systems.
The outage raised questions about the long-term reliability of Microsoft Outlook. Microsoft’s cloud architecture allows for rapid intervention during outages, but this incident highlights potential vulnerabilities in their service.
No timeline has been shared for a full resolution. Microsoft has begun deploying fixes as of midday Tuesday.
