Global disruptions
The Microsoft 365 outage began midday Thursday and continues through Friday morning and affects email, cloud, and AI services. Ciaran Martin, the former head of the UK National Cyber Security Centre, said the disruption looks like "one of the biggest outages of all time" and suggested it could be "worse" than previous outages from Amazon Web Services or CrowdStrike. This disruption is clearly one of the most significant technical failures in recent history. In Japan, deputy chief cabinet secretary Masanao Ozaki reported that the error disrupted government IT infrastructure, affecting multiple state-run departments. Doctors could not send patients "important" updates on medication changes, people could not receive verification codes to complete bank transfers, the Supreme Court in the Philippines saw its legal work derailed, and a Colorado sheriff’s office struggled to process bond payments for the immediate release of prisoners. The financial sector also experienced disruptions. Businesses, hospitals, police departments, and schools were among those scrambling to work around the disruption because few public bodies remained immune to the error. This outage has impacted the ability of many organizations to function normally. The error affects a wide range of Microsoft 365 services, including email, cloud, and AI tools.
Microsoft response and recovery
Microsoft estimated in January that the total number of paid Microsoft 365 commercial subscriptions exceeds 450 million, a figure that indicates the massive scale of the disruption. To help preserve delayed mail during the event, the Microsoft 365 Status account on X extended email timeout to 48 hours. Microsoft attributed the outage to failed server health checks and told users on a status page that there is "no evidence of malicious activity associated with this incident." The tech giant struggled for hours to find mitigations to restore user access, though Microsoft stated on X that it is "aggressively pursuing all pathways to reduce impact." Microsoft has documented the full list of services impacted by the error and moved early Friday morning to protect customers around the world from losing emails during these extended disruptions. The company promised to share a full Post-Incident Report with root cause and defense-in-depth actions once mitigation is complete. Recovery actions remain ongoing.
