Widespread Microsoft Outlook Outage Affects Global Users
Severity: Low (Score: 36.9)
Sources: Computing, downdetector.com, Bleepingcomputer, support.microsoft.com
Summary
On April 27, 2026, Microsoft Outlook experienced a significant outage affecting users worldwide, particularly those using Microsoft 365 Business and Enterprise services. Users reported issues such as sign-in failures, unexpected logouts, and 'too many requests' errors. The outage began early in the morning, with thousands of complaints logged on outage-monitoring platform DownDetector. Microsoft attributed the disruption to a 'recently introduced change' and confirmed that some users were being signed out of their accounts. By April 28, Microsoft announced that service health had returned to normal, but advised iPhone users to manually re-enter their credentials to regain access. The company is still investigating the root cause of the outage and has not disclosed the number of affected users or specific regions. This incident follows a series of recent technical problems with Microsoft services, including previous outages in January and March 2026. Key Points: • Microsoft Outlook outage affected users globally, causing widespread login issues. • The outage was linked to a recent change, with users experiencing 'too many requests' errors. • Microsoft advised iPhone users to re-enter credentials to restore access to their accounts.
Key Entities
- Zero-day Exploit (attack_type)
- Microsoft (company)
- United States (country)
- Office.com (platform)
- outlook.com (domain)