Microsoft 365 services suffered a major failure on Thursday afternoon US time that rolled straight into the local working day on Friday, November 13, leaving Australian workers without Outlook, Teams, or Copilot, Insurance Business reported.
The disruption reached well beyond inboxes, according to ABC News. Councils in regional New South Wales announced closures of Service NSW centres, and some Sydney councils’ customer service systems were affected.
We're testing a configuration change to address a problem that's causing servers to fail automated health checks and become unavailable. In parallel, we've initiated a restart of all affected servers and are monitoring health as they return to service. More info under EX1550543…
Campbell McPhee, director of Western Meat Exporters in western Queensland, explained that the firm had resorted to traditional phone calls with clients and suppliers because email orders were unavailable. The School of the Air in Longreach cancelled online lessons for students on sheep and cattle stations, while Adelaide business owner Bronte Hough said he couldn’t process orders, print invoices, or make deliveries.
Critical Services Remain Stable
Critical services largely held up during the disruption. The Bureau of Meteorology said that its forecasts and warnings remained functional, the AusAlert national warning system operated without interruption, and the Australian Energy Market Operator confirmed that the energy networks and markets it manages experienced no disruptions. The ABC found no direct impact on frontline police, court operations, or Sydney Airport.
Swinburne University of Technology associate professor Ali Yavari shared with ABC News that the primary worry centred on employee behavior moving forward. “Out of frustration or urgency, employees may turn to personal email accounts, unmanaged devices or unapproved messaging and file-sharing services to keep working,” Yavari told ABC News.
Once sensitive information moves outside an organisation’s security controls, Yavari said, the result can be unauthorised disclosure, loss of oversight, and privacy or confidentiality breaches. “Those consequences can outlast the outage itself,” he said.
Security Tools and Scammers
Based on ABC reporting, Microsoft’s list of potentially impacted services featured various Microsoft Purview offerings—including data loss prevention and communication compliance—alongside Intune and Defender for Office 365. Many organisations rely on those tools to detect sensitive data leaving the business.
Scammers saw an immediate opportunity. ING cautioned its clients about tricksters reaching out with claims that they could resolve Microsoft-related issues, advising people to avoid granting device access to anyone without first verifying authenticity via the company’s official phone number. The office of the home affairs minister said that Lieutenant General Michelle McGuinness, the National Cyber Security Coordinator, was briefed on the failure and actively investigating it.
Server Recovery Challenges
Microsoft clarified that the incident stemmed from a massive volume of unexpected server shutdowns rather than a traffic surge, which redirected the existing workload onto remaining infrastructure. A Microsoft spokesperson told the ABC there was “no indication this is a cyber attack.”
Recovery proved uneven. After restoring certain servers through an alternative health check procedure, Microsoft reported that these healthy servers failed again once they resumed processing traffic. The corporation explained that it was in the process of rebuilding a group of servers using an older software setup while investigating whether a limited set of recent configuration changes played a role in the problem.
Reports of Outlook problems on Downdetector peaked at 138,058, and the disruption ran for more than five hours by Thursday evening in the US, Reuters reported. Downdetector said that nearly seven in 10 reports came from the United States, according to the ABC.
Keep reading