A global Microsoft 365 outage disrupted Outlook, Teams, and Copilot, affecting enterprise and government systems worldwide.
Microsoft reported gradual stabilization without any indications of malicious activity, while handling queued workloads and extending email timeout limits.
The issue, which began on Thursday, prevented Outlook users from sending and receiving messages. Microsoft Teams, Copilot and other Microsoft 365 services were also affected. Microsoft said it was seeing early signs of stabilization, but the services' capacity had not returned to normal levels and their operation remained unstable.
To recover, the company’s teams are decongesting traffic, restarting and repairing the affected infrastructure, and gradually bringing it back up, monitoring its health. They are also managing backlogs and queues. Microsoft said it has no indication that the incident was caused by malicious activity. Charles Lamanna, the company’s executive vice president for Copilot, Agents and Platform, also told X that there was no evidence of malicious activity or a cyberattack. The company said it will publish a detailed report on the root causes and measures to strengthen its systems after the recovery is complete.
The impact reached businesses and government agencies in many countries. Agencies in the US, Australia and Japan were affected, including police and intelligence agencies in Australia. Singapore reported problems with some government information systems, but said emergency services remained fully operational. In India, workers returning to work after the Diwali holiday took to social media to express their frustration with the outage.
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In Japan, the government and major businesses have been hit by the disruption. Several companies told the Financial Times that there may be delays in sending and receiving emails. Sagawa Express has suspended same-day bookings for luggage storage services at train stations and airports nationwide. According to local reports, some banks and brokerages have been using faxes to confirm transactions.
The outage also affected corporate announcements. Richemont, the Swiss luxury goods group that owns Cartier and Chloé, postponed its first-half earnings report scheduled for Friday. Workhorse Group, a U.S.-based electric truck maker, postponed its quarterly earnings report to Thursday. OpenAI and Anthropic reported bugs affecting their connections to Microsoft 365.
Microsoft said the next update was expected at 10:00 UTC, which is 12:00 Greek time. The Service Health Status update described in the announcement was posted at 09:14:20 UTC, which is 11:14 Greek time.
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