Summary: Microsoft has resolved a coding issue that caused a widespread outage affecting Microsoft 365 apps, particularly Outlook and Exchange Online, over the weekend. The incident also led to degraded functionality of Teams and Power Platform, but was addressed by reverting the problematic code change. Additionally, ongoing issues with Exchange Online on iOS have been reported, related to authentication token errors linked to a third-party application.
Affected: Microsoft 365, Outlook, Exchange Online, Teams, Power Platform, Purview
Keypoints :
- The outage began around 8:40 PM UTC and was resolved by 9:45 PM UTC.
- Microsoft plans to review the change management process for better detection of such issues in the future.
- Ongoing iOS issues with Exchange Online are potentially linked to third-party authentication token errors.
- Previous incidents involved networking configuration and DNS changes impacting Azure services and Entra ID authentication.