Arizona Tribune - Microsoft Outage Disrupts Outlook and Teams for Hours Globally

Microsoft services including Outlook and Teams experienced a widespread disruption lasting roughly ten hours on Thursday, impacting businesses and governments worldwide. The tech giant attributed the failure to unexpected server unavailability and traffic management imbalances, explicitly ruling out a cyberattack as the cause of the global outage.

In its latest update regarding the incident, Microsoft stated that efforts to restore serviceability were not progressing as expected. The company identified alternate workstreams aimed at increasing capacity to address sustained traffic management imbalances. Earlier in the day, Microsoft had pointed to a number of servers being unexpectedly unavailable and clarified that the issue was not driven by an increase in user traffic.

Downdetector, which tracks outages by collating status reports from various sources, recorded more than 130,000 reports of Outlook problems in the United States at approximately 1 p.m. ET on Thursday. By 9:30 p.m. ET, the platform still showed over 25,000 reports of Outlook issues in the US. The disruption also affected several Microsoft services in the Asia-Pacific region, including India, Australia, and Japan, early on Friday local time.

In a service health notice, Microsoft explained that features of Microsoft 365 services dependent on Exchange Online and email were affected, while elements not relying on Exchange Online remained functional. Exchange Online is the company’s cloud-based messaging platform that delivers email, calendar, contacts, and tasks. As capacity was restored, users experienced limited recovery as their clients gradually reconnected.

Australian Home Affairs and Cybersecurity Minister Tony Burke stated at a press conference that Microsoft believed it was not dealing with a cyberattack. He compared the situation to the CrowdStrike malfunction of 2024, noting that it involved an update that went awry rather than malicious activity. "The impact that they are dealing with ... is very much on email systems," Burke added.

The outage caught several major organizations off guard. Australia’s spy agency and federal police were among the entities affected on Friday. In the United States, the House of Representatives confirmed that the outage affected its users, with engineers working directly with Microsoft to resolve the issue.

The disruption had ripple effects across the technology sector. OpenAI reported investigating an issue with Microsoft connectors where new connections may be broken and tools were not working as expected. Similarly, Anthropic identified an issue with an upstream provider affecting its Microsoft 365 connector.

This incident follows another significant outage last month when Microsoft’s Azure cloud platform failed, affecting the tech giant’s suite of productivity software and a range of industries worldwide. The economic impact was already visible in corporate scheduling; electric truck maker Workhorse Group rescheduled its third-quarter results report from November 12 to November 16, citing business disruptions caused by the global Microsoft outage.

The CrowdStrike malfunction of 2024 remains one of the largest internet disruptions in recent history, hobbling technology systems in hospitals, banks, and airports. That event highlighted the vulnerability of the world’s interconnected technologies. While Microsoft has not confirmed a direct link to that incident, the comparison underscores the potential scale of failures in critical digital infrastructure.

Microsoft stated that restored servers remained stable so far and that it was shifting traffic to alternate routes wherever possible while streamlining the process to bring remaining affected servers back online. The company noted that as capacity is fully restored, users may experience a gradual recovery as their clients reconnect.

A.Anderson--AT