Microsoft has restored Microsoft 365 services following a global outage that disrupted applications such as Outlook, Teams, and Exchange Online for more than 24 hours. The company confirmed that the disruption was not caused by a cyberattack or artificial intelligence agents.
On Saturday, Microsoft announced that it had successfully restored service to all remaining impacted customers and regions. The company pointed customers to incident MO1550821 in the Microsoft 365 admin center for further updates.
According to Microsoft, the technical issue originated from a problem introduced during an earlier network capacity upgrade that emerged following a recent network change. After addressing the underlying issue, services were restored gradually while the company monitored system stability. Microsoft issued an apology for the disruption and stated it would publish a full post-incident review once its internal investigation is complete.
The global outage began on Thursday, affecting access to Exchange Online mailboxes alongside features linked to Outlook, Teams, and Microsoft Copilot. Government agencies in the United States, Japan, and Singapore encountered email issues during the event, and connections between Microsoft 365 and various AI assistants were temporarily impacted.
Following the restoration, OpenAI reported that the Microsoft 365 connector in ChatGPT was operating normally again. Anthropic likewise marked its Microsoft 365 connector and Claude for Outlook incidents as resolved.
