The incident began late Thursday, India time, when multiple Exchange Online servers abruptly went offline, overwhelming the remaining network capacity with unsustainable traffic loads. Companies, healthcare providers, and major airlines adapted by migrating key communications to alternative software such as Slack, Zoom, and social media channels. Although Microsoft observed improvements by Friday evening as delayed messages cleared, third-party connectors for AI tools like Claude and ChatGPT experienced extensive functional failures.
Key points
Microsoft confirmed that the global service disruption showed no signs of being caused by…: Microsoft confirmed that the global service disruption showed no signs of being caused by an external cyberattack.
Organizations across multiple sectors sustained essential workflows by shifting communica…: Organizations across multiple sectors sustained essential workflows by shifting communication to platforms like Slack, Zoom, and Webex.
This disruption represents the second major downtime event for the technology company fol…: This disruption represents the second major downtime event for the technology company following an eight-hour Azure outage in October 2025.
Sources checked by our analysis pipeline: 1
NEW DELHI: A global Microsoft 365 outage disrupted operations across offices as Outlook email, Teams calendars and the tools that connect ChatGPT and Claude to Microsoft's workplace services remained paralysed.
The problem, which started late Thursday (India time), was partially restored on Friday evening though intermittent issues persisted. By late evening in India, Microsoft said mailbox access was improving, and delayed emails were being processed, while stating that it had found no indication of a cyberattack. This was the second disruption since Oct 2025 when MS Azure services faced an eight-hour-long global outage.
Companies that rely on MS services were forced to opt for other alternatives such as Slack, Webex and Zoom to keep their operations going.
Tata Motors Passenger Vehicles cited the outage in a stock exchange filing and shifted its quarterly results webcast with Jaguar Land Rover executives to StreamCart. IBM reportedly moved workplace communication to Slack during the disruption. HDFC Bank told customers on X that its banking services remained available.
Airlines and airport operators said operations continued while email communication with passengers was disrupted. Travellers who…
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