Microsoft's recent widespread outage, affecting millions of users, was caused by a network upgrade error that triggered a feedback loop, according to internal analysis. The company attributed the incident to a misconfiguration during a routine maintenance update. Experts suggest the feedback loop amplified the disruption, leading to prolonged service interruptions. The outage began on Monday and lasted over 12 hours, impacting email, cloud services, and collaboration tools. Microsoft confirmed the issue originated from a faulty network component, which caused data routing failures. The company is reviewing its maintenance protocols to prevent similar incidents. This is the second major outage for Microsoft this year, raising concerns about system reliability. The incident highlights the complexity of managing large-scale cloud infrastructure. Regulatory bodies are expected to review the incident in the coming weeks.