A global outage affecting Microsoft Outlook and Teams has begun to ease after nearly 24 hours of disruption, which severely impacted online communications for businesses and government agencies worldwide. Microsoft attributed the incident to server issues and confirmed that it was not linked to any malicious activity. The outage forced some organizations to revert to traditional methods like faxing and halted at least one European bond repurchase.
The outage, which started around 1725 GMT on Thursday, affected hundreds of millions of users relying on these essential workplace applications. Users reported difficulties in sending emails, managing calendars, and hosting virtual meetings, leading to significant operational disruptions across various sectors. Government agencies in countries including Australia, Japan, and the United States experienced delays, while trading firms and airlines also warned customers of communication lags.
Microsoft’s services, particularly those tied to Exchange Online, were primarily impacted, although organizations hosting Microsoft services on their own servers were less affected. This incident marks one of the longest outages in Microsoft’s history and the second major disruption to its services this year. Reports from Downdetector indicated that the outage generated over 7.4 million reports globally, peaking at nearly 20,000 per minute, which is more than 1,500 times the normal level.
Luke Kehoe, lead industry analyst at Ookla, noted, “It shows how much of the working day now runs through one provider’s email and collaboration tools.” Despite the chaos, Microsoft shares saw a slight increase in afternoon trading, reflecting a year-to-date gain of approximately 8%.
The financial implications of the outage could lead to numerous insurance claims, with estimates of global insured losses ranging between $300 million and $500 million. This figure is significantly lower than the financial toll from a previous outage in 2024, which caused widespread disruptions to over 8 million Windows-based computers.
Microsoft has faced multiple outages this year, including incidents affecting its 365 services and Azure cloud platform. Analysts express concern that repeated outages could prompt IT departments to reconsider their reliance on a single provider, despite the high switching costs associated with changing embedded tools.
In response to the outage, a spokesperson for the UK government stated that they are collaborating with Microsoft to resolve the issues affecting critical services, including the NHS and London’s Metropolitan Police. The NHS reported that local services were resorting to alternative measures, such as using paper records, while the Metropolitan Police faced challenges in reporting certain crimes online.
As businesses continue to navigate the fallout from this incident, the reliance on Microsoft’s suite of workplace software raises questions about the resilience of cloud-based services and the potential need for diversification among service providers.
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