EX1254044: Exchange Online Service Health Incident (Service Degradation)

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365 Service Alert

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Mar 17, 2026, 5:00:47 AMMar 17
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Some users are unable to use Microsoft Outlook Classic while the Microsoft Teams Meeting Add-in is enabled.                                                                                                                                                                                                 
Microsoft

Some users are unable to use Microsoft Outlook Classic while the Microsoft Teams Meeting Add-in is enabled

ID: EX1254044

Issue type: Incident

Status

Service Degradation

Impacted services

Exchange Online

Details

Title: Some users are unable to use Microsoft Outlook Classic while the Microsoft Teams Meeting Add-in is enabled

User impact: Users are unable to use Microsoft Outlook Classic while the Microsoft Teams Meeting Add-in is enabled.

More info: If Teams Meeting Add-in is disabled then Outlook Classic functions as normal.

As a workaround, users can also perform an Online Repair of Office or update Outlook to the latest version to resolve the issue.

Current status: We've identified that a previous Outlook build version is causing impact to occur. We're working with your representatives to ensure that the latest Outlook version is enabled, to mitigate impact.

Scope of impact: Your organization is affected by this event, and users attempting to use Microsoft Outlook Classic while the Microsoft Teams Meeting Add-in is enabled are impacted.

Start time: Thursday, March 12, 2026, at 12:36 PM UTC

Root cause: A previous Outlook build version that is enabled is causing impact to occur.

Next update by: Thursday, March 19, 2025, at 10:30 AM UTC

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