Microsoft outage enters second day as company rules out hack
As millions grapple with disrupted emails and downed services, attorney and cybersecurity expert Leeza Garber explains why a simple server issue can cripple a tech giant, and why it’s reasonable to wonder if AI or hackers were involved.
Microsoft said Friday afternoon that a global outage affecting its suite of workplace products, most notably its Outlook email service, was caused by a bug introduced during a network capacity upgrade.
“We have addressed the underlying issue and continue to restore service to remaining customers and regions,” Microsoft said in a statement. “Given the scale of demand, we restored services gradually, validating stability at each stage. While this took longer, it helped ensure a stable restoration.”
Earlier Friday, the company had already ruled out a hack, but in its latest statement, it definitively said the disruption in service was not caused by cyberattacks or meddling from AI agents.
Microsoft said it would provide a full report on the root cause once it completes an internal investigation.
People pass near the Microsoft offices in Tokyo on Nov. 13, 2026. (Andrew CABALLERO-REYNOLDS / AFP via Getty Images / Getty Images)
“We are deeply sorry for the disruption this incident has caused our customers and partners. We know the trust they place in our services and take that responsibility extremely seriously. We are seeing broad recovery and stability across our services,” Microsoft said.
The ability to send and receive emails with Outlook began returning for some users as early as Friday morning.
The disruption began Thursday afternoon and crippled Exchange Online, the underlying engine that powers Microsoft’s email infrastructure. This hampered everyday operations for major businesses and millions of users worldwide.
In morning service updates at 6 a.m. and 7 a.m. ET, Microsoft said it was seeing recovery progress across Europe and the Asia Pacific region, noting that Japan remained “comparatively more stable.”
Services in North America were also improving by 7 a.m., though the company cautioned at the time that “some users may still experience intermittent issues as recovery actions continue.”
NATIONWIDE MICROSOFT EMAIL SERVICE OUTAGE DISRUPTS BUSINESS AND PERSONAL ACCOUNTS ACROSS US
A computer screen showing no service available from Microsoft Outlook on Nov. 13, 2026, in Falmouth, Cornwall, United Kingdom. (Hugh R Hastings/Getty Images / Getty Images)
MICROSOFT AI BEATS DOCTORS IN SIMULATED DIAGNOSIS TEST
Microsoft said it extended its email timeout window to 48 hours to protect delayed messages while services recover. Normally, if an email cannot be delivered within a standard window, mail servers give up and bounce the message back to the sender.
That gives emails caught in the backlog since the outage began Thursday afternoon until at least Saturday afternoon to reach recipients once systems recover.
Outlook, of course, is used for far more than email. Users had reported disruptions to key scheduling…
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