Outage in Microsoft 365
Some users may be unable to use Microsoft Outlook Classic while the Microsoft Teams Meeting Add-in is enabled
Minor
March 12, 2026 - Started 5 days ago
Incident Report
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're analyzing support provided information to determine our next troubleshooting steps.
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.
Next update by: Tuesday, March 17, 2025, at 9:00 AM UTC
Components affected
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Latest Updates ( sorted recent to last )
about 3 hours ago - at 03/17/2026 08:54AM
Title: Some users may be unable to use Microsoft Outlook Classic while the Microsoft Teams Meeting Add-in is enabled
User impact: Users may be 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: Users attempting to use Microsoft Outlook Classic while the Microsoft Teams Meeting Add-in and previous Outlook build version is enabled may be 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
about 5 hours ago - at 03/17/2026 06:55AM
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're analyzing support provided information to determine our next troubleshooting steps.
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.
Next update by: Tuesday, March 17, 2025, at 9:00 AM UTC
Latest Microsoft 365 outages
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