A massive Microsoft outage that began Thursday afternoon continued into Friday morning, disrupting email, workplace communications and other online services for businesses, government agencies and individual users around the world.

The widespread disruption affected Microsoft 365 services, including Outlook email, Microsoft Teams, SharePoint, OneDrive and the company’s artificial intelligence assistant, Copilot. Users reported being unable to access email accounts, send or receive messages and connect to various Microsoft applications.

According to the outage tracking website Downdetector, more than 130,000 reports of problems with Outlook were recorded at the height of the disruption Thursday. Additional complaints involved Microsoft 365 and other services.

Microsoft acknowledged the outage and said its engineers were working to restore service. The company determined that a number of servers had unexpectedly become unavailable, placing additional demand on the remaining infrastructure and creating widespread connectivity problems.

Efforts to restore the affected servers have produced limited improvements, but Microsoft reported that some recovery measures were not working as expected.

The outage has affected businesses and government operations in multiple countries. In the United States, the House of Representatives reported disruptions to its technology services. Internationally, government agencies and airlines also experienced problems with email and other Microsoft systems.

The disruption has also affected some connections between Microsoft services and artificial intelligence platforms, including OpenAI and Anthropic.

Microsoft says it has found no indication that the outage was caused by a cyberattack.

The company has been working to restart affected servers, redistribute traffic and identify the underlying problem. However, as of early Friday morning, Microsoft had not announced a timetable for full restoration.

The outage highlights the widespread dependence of businesses, government agencies and individuals on Microsoft’s cloud-based technology. Users experiencing problems with Outlook or other Microsoft 365 services may need to use alternative communication methods until normal operations resume.