Microsoft restores Outlook and Teams after day-long Microsoft 365 outage

What happened

Microsoft 365 services began failing on Thursday afternoon, according to Engadget, with Outlook, Teams and Copilot 365 among the affected products. The disruption hit businesses and organisations across the world and lasted well into Friday.

Microsoft worked through the night to bring systems back. Around 10PM ET on Thursday, the company admitted that some of its attempts to improve serviceability had not worked as intended. By 2:45AM the next morning, it reported positive results for service stability and greater capacity after making changes to how traffic was routed.

The recovery timeline

At about 8:30AM on Friday, Microsoft said recovery was under way in all affected regions, with North America improving most, much of Europe showing steady gains and early signs of progress in Asia Pacific. Some users still faced delayed email deliveries or unstable connections at that point.

In a later update at 10:39AM, the company said availability and email delivery were improving across a growing part of its infrastructure. It also apologised, acknowledging that customers rely on its services for daily work. Microsoft said a post-incident report explaining the root cause would follow once the situation is fully resolved.

Who was affected

The reach of the outage was unusually broad. Engadget reports that calls to emergency services, governments, the US House of Representatives, court systems, schools and health care providers were all disrupted.

The UK's National Pharmacy Association warned that the email problems could delay some prescriptions. In Japan, where most businesses and institutions reportedly depend on Microsoft services, some companies temporarily fell back on fax machines to keep working.

No sign of an attack

Microsoft said it had found no evidence that malicious activity caused the failure. The company has not yet explained what went wrong, so the technical reason for the outage remains unconfirmed until the promised report appears.

Until then, the incident stands as another reminder of how much of daily work, public services and communications depends on a small number of cloud providers.

What it means for users

Engadget notes that the day-long failure shows why organisations need redundancy plans, such as backup ways to communicate when a primary cloud service goes dark. For many smaller users, the practical lesson was simpler: assume email and chat may be unavailable at any time.

Some workers in Australia and the UK took the opportunity to finish early on Friday, though most returned to normal routines as services recovered. One office worker in Japan, quoted by the Japan Times, joked that the quiet inbox felt like heaven before realising it was only an outage.

Customers still experiencing slow email or dropped connections were advised to follow Microsoft's official service status updates as the recovery continues.