Microsoft's Outlook and Microsoft Teams services gradually recovered on Friday after a global outage that lasted close to 24 hours and severely disrupted online communication. The incident began on Thursday evening and peaked on Friday morning as business hours began in Asia and Europe.
According to Reuters, Microsoft said the outage was caused by server problems that particularly affected its cloud-based email and calendar system, Exchange Online. The issue also affected the company's Copilot AI assistant. Microsoft stated it found no indications of a cyberattack and ruled out a failure of the artificial intelligence itself. The company stabilized systems by rolling out software fixes gradually.
Scope and concrete impacts
Because these programs rank among the world's most widely used office applications, hundreds of millions of people were unable to send emails, manage calendars or hold online meetings. Downdetector, owned by Ookla, logged more than 7.4 million problem reports worldwide; at the peak about 20,000 complaints arrived per minute, more than a thousand times the normal level.
The outage affected government agencies, stock traders and airlines from Australia and Japan to the United States. In the United Kingdom the London police online crime-reporting system experienced disruptions, and the National Health Service (NHS) reverted to paper-based administration in several locations. In Taiwan a financial firm had to confirm trades by fax, and another cancelled a bond buyback transaction. Swiss luxury group Richemont and U.S. electric-vehicle maker Workhorse Group postponed the release of earnings updates, and operators including Euronext, Maersk, several Indian carriers, as well as systems at OpenAI and Anthropic, reported disruptions.
Why this matters for the global economy
The incident highlighted how dependent the global economy has become on the cloud infrastructures of a small number of tech giants. Microsoft 365 services have experienced outages before, in October of last year and January of this year, and last month issues on the Azure cloud platform caused global disruption. Analysts say repeated faults may make corporate IT departments more cautious, but replacing deeply embedded software would be very costly, so mass migration away from these platforms is unlikely.
Financial consequences and market reaction
Morningstar DBRS estimated that insured losses from this outage could be between $300 million and $500 million globally. That figure is well below the estimated financial damage from the 2024 CrowdStrike outage, which Morningstar DBRS put between $400 million and $1.5 billion. Despite the technical problems, Microsoft shares rose slightly in Friday afternoon trading and have gained roughly 8 percent since the start of the year.
Conclusion
Microsoft's nearly 24-hour service disruption underlined the centralized risks of cloud-based systems, while the company maintains the root cause was a server fault rather than an external attack. The operational and economic effects were widespread, and Morningstar DBRS's estimate points to insured losses in the hundreds of millions of dollars.
