A major global Microsoft outage has caused widespread disruption, disabling entire services – including email, collaboration platforms and artificial intelligence products – across at least 74 countries.

With over 430 million users relying on Microsoft 365, the disruption has grounded normal business operations for millions worldwide (and delighted many office workers on a Friday morning who are already declaring a ).

How did it start?

The massive disruption began on . Monitoring website Downdetector recorded a sharp surge in user-submitted complaints, peaking at nearly 140,000 reports around 18:00 GMT on Thursday.

The sudden failure threw corporate communications and digital workflows into chaos, prompting immediate speculation regarding a before official clarifications were issued.

Which services are affected?

The outage primarily affects programs bundled with , an essential cloud suite used by organisations worldwide to connect and collaborate.

• Core productivity tools: Outlook mailbox access, calendar applications, OneDrive file viewing and Microsoft Teams have experienced severe connectivity issues. While some users report that messaging and online meetings remain functional, many are unable to send or receive emails or check calendar details.

• Microsoft’s artificial intelligence software, Copilot, has malfunctioned or failed to operate properly. The knock-on effect has also impacted other major tech companies relying on Microsoft infrastructure, such as and Anthropic.

What caused it?

Microsoft has firmly ruled out any cyberattack, confirming there is no indication that a security breach triggered the disruption. Instead, the company attributed the ongoing crisis to an “elevated load” on its infrastructure. Specifically, a large number of servers became “unexpectedly unavailable,” creating a cascading effect that redirected massive volumes of traffic onto remaining servers, severely straining them.

Experts have emphasised that the crisis exposes the fragility of modern cloud concentration. Smitarani Tripathy, a social media analyst at GlobalData, noted that the incident illustrates “how a disruption to one service can quickly affect an entire working day, extending beyond email to collaboration, task management and AI tools.”

Marijus Briedis, Chief Technology Officer at NordVPN, added: “The scale of this outage highlights just how interconnected our digital world has become. When a major technology platform experiences disruption, the knock-on effects can spread rapidly across businesses, industries and essential services…”

Who is affected – including police, NHS and government

The disruption has extended far beyond corporate offices, however, touching and government agencies globally.

• Healthcare and public services: In the UK, several warned of potential system failures, instructing patients to handle urgent queries over the phone rather than through email or online web forms.

• Government bodies: International public sector agencies have reported disruptions, including the Singaporean government and Australia’s national security and intelligence agencies.

• Global enterprises: Businesses worldwide have lost a productive business day. For example, electric truck maker Workhorse Group was forced to postpone its scheduled third-quarter financial results release due to the technical disruption.

What are the knock-on effects?

With global email networks crippled and productivity applications offline, organisations have effectively lost a business day. Industry experts emphasise that the incident serves as a severe wake-up call regarding deep digital dependency. New Zealand-based advisory expert Paul Spain pointed out that with email systems down, the inability to communicate or verify transactions leaves users intensely frustrated.

Similarly, cybersecurity expert Troy Hunt noted: “Microsoft is a massive part of the internet backbone and reminds us how critical email still is. Not only does this outage affect many people’s ability to work but also things like the ability to communicate about appointments, purchase things that need verification, create or access accounts and services.”

What is the timeline for getting it sorted?

Microsoft’s restoration efforts have proven complex and unpredictable. While the tech giant reported “positive results” and “marginal success” in monitoring and rebalancing server capacity across regions, it acknowledged that initial fixes were “not going as expected.”

Some services that were temporarily restored became unresponsive again, and Microsoft has not provided a definitive root cause or a firm ETA for complete resolution. Experts advise organisations to establish secure backup communication channels, test contingency plans and implement robust recovery procedures to mitigate the fallout of such centralised tech failures.

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