Is Outlook Down? Microsoft Reports Sign-on Issues With Email Client

Microsoft reported sign‑on issues with Outlook.com on April 27, 2026, after users began experiencing login failures just before 5:00 a.m. ET, including “too many requests” errors and unexpected sign‑outs. The company said it was reverting a recent update to try to resolve the problem. Downdetector outage reports for the Outlook iOS client climbed above 1,200 by 9:38 a.m. ET. While the article does not report market moves, such service disruptions can create short‑term reputational and sentiment pressure on Microsoft (MSFT.OQ), potentially weighing on intraday trading or analyst attention until the issue is fully resolved.