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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
Exchange Online

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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

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