Microsoft Outlook Outage Disrupts Global Logins

Microsoft Outlook suffered a significant outage Monday morning, disrupting email access for users worldwide as login failures and authentication errors prevented many from signing into accounts.

The issue surfaced around 10 a.m. in the United Kingdom and earlier for users on the U.S. West Coast, coinciding with the start of the workday. Outage tracking site Downdetector recorded sharp spikes in reports, with more than 800 complaints from the U.K. and over 400 from the U.S. within hours. Login problems accounted for the majority of issues, comprising about 64 percent of reports, followed by app malfunctions at 24 percent and difficulties receiving messages at 10 percent.

Microsoft confirmed the disruption on its service health status page, noting intermittent sign-in failures for Outlook.com users, including "too many requests" errors and unexpected sign-outs. The company specified impacts on iOS users and potential issues with authentication. "We're seeing specific errors related to authentication key failures," Microsoft stated. "We're working to determine the underlying cause in order to determine our next mitigation steps." Engineers reverted a recent change but reported no...