Full Breakdown
Microsoft Outlook.com Outage Disrupts Millions of Users on April 27, 2026
4/28/2026, 3:43:30 AM
Widespread Outlook.com Sign-In Outage
On Monday, April 27, 2026, Outlook.com users experienced intermittent sign-in failures. Errors included “too many requests” messages and unexpected sign-outs, particularly on the iOS mobile app. Reports began just before 5 a.m. ET and persisted for at least eight hours, affecting personal-use accounts while other Outlook services remained operational.
Background & Context
Outlook.com is Microsoft’s email service for personal use, distinct from its Microsoft 365 offerings. The outage was confined to Outlook.com, leaving corporate email and other Microsoft cloud products unaffected. The issue emerged as users began logging in for work.
Timeline & Statistics
- ~5:00 a.m. ET: First user reports of sign-in failures appear on DownDetector.
- 8:50 a.m. ET: DownDetector logs ~1,100 reports; users note iOS app sign-outs.
- 9:38 a.m. ET: Reports climb to >1,200.
- Mid-day: Reports peaked at almost 1,500 per hour, later stabilizing around 1,400.
- Later afternoon: Reports hovered near 1,173 as the outage waned.
Overall, nearly 1,500 reports were recorded, with iOS users disproportionately affected.
Official Statements & Responses
Microsoft acknowledged the problem, stating it was investigating intermittent sign-in failures, “too many requests” errors, and unexpected sign-outs. The company said it was analyzing service telemetry to identify root causes and had reverted a recent configuration change, though the reversal did not immediately restore service. Updates were posted on the Microsoft 365 Status X account and the Service Health Status portal, indicating ongoing monitoring of two error scenarios and planned mitigation actions.
Criticism & Opposition
Users voiced frustration over unclear communication and the lack of a timeline. On X, a user called the outage a “joke” and demanded clear explanations and an estimated fix time. DownDetector threads highlighted repeated sign-in failures on the iOS app, with callers urging faster resolution and transparent updates.
Verbatim Quotes
- “We're working to mitigate an issue that may cause some users to experience intermittent Outlook.com sign-in failures on mobile apps,” — Microsoft spokesperson, email
- “We're investigating an issue where users may be experiencing intermittent issues accessing http://Outlook.com,” — Microsoft statement, service health page
- “What a joke. Tell us in English what is wrong and what you are doing to fix it and an estimated timeframe. Stop pretending it is a small,issue,” — User, X
- “We've completed reverting the recently introduced change, however, this has not produced any relief. We're continuing to investigate the unexpected increase in error rates affecting two separate error scenarios to identify any potential root cause which may be responsible for this. Additionally, we're closely monitoring service telemetry to discover any other potential actions, or mitigation steps,” — Microsoft status page, April 27, 2026
What’s Next
Microsoft said it will keep monitoring telemetry, refine mitigation steps, and post further updates on its status channels. Users are advised to follow the Microsoft 365 Status X account and the Service Health Status portal for real-time information until sign-in functionality is fully restored.
