Vulnerabilities & Exploits

Teams add-in may break Outlook Classic for users

The vendor attributes the problem to a prior Outlook build and is investigating related sync errors affecting Gmail and Yahoo accounts.

1 source · Mar 17

Timeline

• Mar 17 Reported by BleepingComputer

Sources

• Mar 17 BleepingComputer

  Microsoft: Enabling Teams Meeting add-in breaks Outlook Classic

  Microsoft is working to address a known issue that renders the classic Outlook email client unusable for users who have enabled the Microsoft Teams Meeting Add-in.

  original

Vendor digest: Microsoft

Part of the PlainSec briefing for 2026-03-17

Every edition of this story: Teams add-in may break Outlook Classic for users

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