A major Microsoft outage has impacted schools, healthcare systems, businesses, courts, and governments around the world, prompting questions about why the disruption lasted so long and how email delivery is being handled. According to the BBC, services including Teams, Outlook, and AI software Copilot began to be restored nearly 24 hours after issues first surfaced.
Microsoft stated that the disruption was not a cyber-security incident but rather the result of a technical issue that occurred during an earlier network capacity upgrade. The company issued an apology for the widespread disruption, noting that it has addressed the underlying issue and is continuing to restore service to remaining customers and regions.
Understanding the Microsoft Outage Recovery
As recovery efforts progress, the company reported encouraging progress in Europe and improvements in North America. Email queues were described as significantly reduced and approaching normal levels. However, warnings remain in place regarding intermittent access issues, meaning some users may still experience delayed email delivery and difficulty loading inboxes.
To help protect delayed messages as delivery catches up, Microsoft extended the email timeout window to 48 hours. Outlook handles this by waiting longer to receive incoming messages, with timestamps reflecting when the emails are eventually delivered rather than when they were initially sent.
Why the Disruption Lasted So Long
Professor James Ferryman from the University of Reading explained that the technical failure snowballed as servers responsible for setting up secure connections became swamped. When one server falls over, its workload passes to the next while massive numbers of phones and laptops continuously attempt to reconnect. Experts emphasize that systems cannot simply be turned back on all at once and must be brought back online incrementally.
Gergely Orosz, a former software engineer, noted that this incident could be among the most disruptive business email outages of all time, while Australian cyber-security expert Troy Hunt highlighted the critical reliance on Microsoft infrastructure across the internet backbone. With Microsoft 365 apps utilized by more than 430 million people worldwide, the incident caused widespread knock-on effects for global institutions, including city governments, healthcare networks, and police services.
Source: Why is Microsoft's outage lasting so long and will emails be lost? (source-feed timestamp 2026-11-13T18:36:57+00:00). AI-assisted report based on the cited linked article and its RSS feed; details were not independently verified.
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