Microsoft Teams experienced a significant service disruption on December 20, 2025, affecting users worldwide with messaging delays and various functionality issues.
The incident, tracked as TM1200517 in the Microsoft 365 admin center, prompted the company to launch an immediate investigation into the widespread problems.
Incident Overview
Microsoft 365 Status confirmed via official communication channels that users were experiencing delays in Teams messaging functionality, along with problems affecting other service features.
The outage disrupted the platform’s core communication capabilities, affecting businesses and organizations that rely on Teams for daily operations.
Microsoft acknowledged the issue and stated that they are actively investigating the root cause of the service interruption.
According to their official status update, the company’s monitoring systems began detecting signs of recovery in their telemetry data, suggesting that some services were returning to normal operations.
The tech giant emphasized that they are conducting a thorough analysis to identify all affected scenarios and determine what triggered the outage.
This comprehensive approach aims to understand the full scope of the incident and prevent similar disruptions in the future.
During the outage, Teams users reported significant delays in sending and receiving messages, disrupting real-time collaboration and communication workflows.
The service interruption affected various Teams functions beyond messaging. However, Microsoft did not specify all the affected features in its initial statement.
Microsoft indicated that recovery was underway, with its monitoring systems showing positive trends in service restoration.
However, the company continued analyzing the situation to ensure complete resolution across all affected services and user scenarios.
Organizations affected by the outage were directed to the Microsoft 365 admin center for additional information and updates regarding incident TM1200517.
Microsoft has not yet provided an estimated timeline for complete service restoration or disclosed the underlying cause of the disruption.
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