Full Breakdown
Microsoft Outlook Outage on April 27 2026 Disrupts Sign-In for Thousands of Users
4/28/2026, 12:23:28 PM
Incident Overview
On Monday, April 27 2026, Microsoft Outlook users experienced widespread sign-in failures on Outlook.com and the iOS Outlook app. Reports began just before 5 a.m. ET, with “too many requests” errors, unexpected sign-outs, and prompts to re-enter passwords. Microsoft traced the problem to a recent configuration change and rolled back the update at approximately 3:36 p.m. ET, after which the service began to recover.
Timeline of the Outage
- ~5 a.m. ET: Initial login problems reported on Outlook.com and iOS app.
- 8:50 a.m. ET: DownDetector logged nearly 1,100 user reports.
- Mid-day: Microsoft posted a status update noting intermittent failures and “too many requests” errors.
- 3:36 p.m. ET: Microsoft rolled back the recent configuration change.
- Late afternoon: Service health page indicated the outage was receding and recovery was underway.
Data & Statistics
- DownDetector recorded a peak of about 1,500 outage reports early in the day (source 1).
- By 8:50 a.m., nearly 1,100 reports were logged on DownDetector (source 2).
- Users reported being signed out on mobile devices while still able to access Outlook.com via web browsers.
Official Statements & Responses
Microsoft described the incident as an “intermittent issue accessing Outlook.com.” The company said it was “investigating” the problem, analyzing telemetry, and reviewing a recent change. A spokesperson added that Microsoft was “working to mitigate” the sign-in failures on mobile apps and had rolled back the configuration change to restore service.
User Experiences & On-the-Ground Reports
Affected users said they were signed out of the iPhone Mail app and encountered a “Too many requests” page when attempting to log in, while browser access remained functional. The outage prompted some iPhone users to re-enter passwords in Settings to regain access to Outlook accounts.
Criticism & Opposition
User comments highlighted frustration with repeated sign-out prompts and the inability to log in via the mobile app, forcing reliance on desktop browsers and additional password entry steps. No formal external criticism from third-party organizations was reported.
Conflicting Reports & Gaps
Sources differ on the total number of outage reports: one cites a peak of 1,500 incidents, while another notes 1,100 reports by mid-morning. Details about the specific configuration change that triggered the outage remain undisclosed.
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 to CNET
- “We're investigating an issue where users may be experiencing intermittent issues accessing http://Outlook.com,” — Microsoft statement
- “We've discovered some users may experience intermittent sign-in failures, including “too many requests” errors, or unexpected sign-outs.” — Microsoft statement
Why It Matters
Outlook serves as a primary communication platform for millions of individuals and businesses. Prolonged sign-in disruptions can impede email access, delay workflows, and erode confidence in cloud-based productivity services.
What’s Next
Microsoft continues to monitor Outlook’s health, assess telemetry from the rolled-back change, and refine mitigation procedures to prevent similar incidents. Users are advised to stay updated via the Microsoft 365 Status page for further notices.
