Microsoft says it has fully restored Microsoft 365 services following a global outage that disrupted Outlook, Exchange Online, Teams, Copilot and other components for organizations in multiple regions. Microsoft's official status page now reports that products are operating normally.
The company traced the incident to a network issue connected to an earlier capacity expansion that surfaced after a subsequent network change. Microsoft said it found no indication of malicious activity and ruled out involvement by AI systems or AI agents.
Exchange Online infrastructure was the initial point of failure, with effects spreading to connected services. The disruption included the following issues:
- Outlook: Some users could not open mailboxes through the web, desktop, or mobile apps, while message delivery was delayed.
- Teams: Chats and calls were largely available, but calendar access and meeting scheduling were affected.
- Copilot: The service could lose access to workplace data, including email, calendars, and documents.
Microsoft said recovery took longer than expected because some systems would temporarily return before becoming unavailable again as traffic resumed. Engineers worked to restore affected servers, rebalance traffic, and add capacity while monitoring message queues and Exchange-dependent product scenarios.
Organizations that sent important email during the outage may still want to check Sent folders and delivery logs before sending duplicate messages. Microsoft has promised a post-incident report detailing the technical cause and measures intended to prevent a recurrence.
