Overview
- A widespread outage began on Thursday, November 12, when users and Downdetector logged a surge of errors that included more than 130,000 reports for Outlook in the United States.
- Microsoft said a portion of its infrastructure experienced unusually high load, started mitigation and phased recovery steps, and reported incremental improvements while warning service health remains variable.
- The company has said investigators find no indications of malicious activity, but the root technical cause remains unconfirmed and internal post-incident reviews are ongoing.
- The outage disrupted governments, courts, airlines, universities and businesses worldwide, forcing many to use phones, paper or messaging apps and causing companies such as Air India and IndiGo to reroute customer communications.
- Experts say the incident highlights risks from concentrating critical services with a few cloud providers, raises the chance of fraud during confusion, and underscores the need for tested continuity plans, clear SLAs and 3-2-1 backup practices.