CrowdStrike experienced a faulty update that caused disruptions to nearly all Microsoft Windows sensors, impacting approximately 8.5 million devices and resulting in significant losses for Fortune 500 companies. CrowdStrike is working to fully restore computer systems and has attributed the failure to a bug in their Falcon security platform. The incident highlights the vulnerability of interconnected IT systems. Delta Air Lines had to cancel flights due to the outage but has since returned to normal operations.