Microsoft Restores Microsoft 365 After Global 24‑Hour Outage

Overview

• A major outage that began on Thursday, November 12, knocked Outlook, Teams, Copilot and other Microsoft 365 services offline worldwide and produced roughly a day of instability before full restoration.
• Microsoft said engineers mitigated overloaded servers, processed the accumulated email backlog and found no evidence of malicious activity while apologizing to affected customers.
• Public services, hospitals, courts, airlines and financial firms reported concrete disruptions such as delayed filings, postponed earnings announcements and use of manual workarounds including fax.
• Industry estimates put global productivity losses in the hundreds of millions to billions of dollars, and regulators and customers are pressing Microsoft for a detailed post‑incident report on root cause and fixes.
• The outage underscores systemic risk from heavy reliance on a single cloud vendor and has renewed calls for supplier diversification, offline backups, independent authentication paths and emergency admin access plans.