19-hour Microsoft outage

A fault in an update to Microsoft’s network capacity, followed by a change to its settings, disrupted Outlook, Teams and Microsoft 365. The company denied that the incident was a cyberattack. The problem began on Thursday, and the affected services were fully restored on Saturday, after an outage lasting more than 24 hours. Reports came in from 74 countries and territories, and *The Wall Street Journal* estimated that around half a billion people use the affected services. The outage disrupted the work of government agencies, healthcare providers, courts and businesses, showing how a failure at a single provider can hinder critical sectors and cause economic losses. The incident underscored the need to make systems more resilient, prepare backup options and business-continuity plans, and reduce reliance on any one technology provider.

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