A 22-hour Microsoft 365 outage affected 430 million users globally across 70+ countries, taking down Outlook and core enterprise services.
Microsoft confirmed the incident was triggered by routine automated checks rather than a security breach, requiring nearly a full day of gradual server recovery.
How the outage was caused
The problem began when routine automated checks took down some of the systems that service the services. The traffic overloaded the systems that remained available, while the restoration was gradual and took almost a day.
Who was influenced worldwide?
About 430 million people use Microsoft 365, and problems were reported in more than 70 countries. The outage affected the email systems of the US House of Representatives and Australian intelligence agencies. It also disrupted judicial services in Singapore and airline support offices in India.
The impact on businesses and states
Flora Hamilton, executive director of the Small Business Charter, called the outage a reminder of businesses' reliance on digital systems. She said email is fundamental to small and medium-sized businesses, as it is essential for communicating with customers and suppliers and for generating revenue.
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Artificial intelligence strategic consultant Walter Pasquarelli said the outage highlighted the reliance of governments, businesses and critical infrastructure on a few large companies. He added that connecting AI digital assistants to email, calendars and files could amplify the impact of a future outage.
Microsoft's stance and experts' suggestions
Gergely Orosz, a former software engineer at major technology companies, noted that such outages are not unheard of, but what was unusual was the time it took Microsoft to restore.
A Microsoft spokesperson explained that, due to high demand, the company has been gradually restoring services to ensure a stable process, although this has increased wait times.
As a possible solution for the future, Orosz suggested separating services by region to limit the extent of an outage, citing Amazon's AWS as an example. Microsoft said it is investigating what went wrong and that the findings will guide steps to prevent similar incidents.
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