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Snow day? Microsoft on Monday confirmed<\/a> a widespread, multi-hour outage affecting Outlook users, leading to email delays and failures, authentication issues, and other problems.<\/p>\n In a post on X<\/a>, Microsoft reported the issue was impacting its Exchange Online service, its cloud-hosted platform for business email, calendar, contacts, and tasks, and then said<\/a> it had identified the problem. <\/p>\n \u201cWe\u2019ve confirmed that users may experience degraded functionality with various Exchange Online functionalities. We\u2019re reviewing service telemetry and diagnostic data to isolate the source of the issue,\u201d Microsoft wrote at 12:43 PM ET on Monday, after an earlier message<\/a> saying it was investigating user reports of Exchange Online problems. <\/p>\n The company said that it identified an issue with an \u201cauthentication component\u201d and is testing what it believes will be a remediation strategy with a portion of the infrastructure to determine if it resolves the problem. If so, it will roll out the solution more broadly.<\/p>\n