Teams Add-in slows Outlook

IBN 4,341 Reputation points

Hello Teams Community

Please I need your help on this issue.

Outlook shows an error saying the Microsoft Teams Meeting Add-in for Microsoft Office is slowing down Outlook.

Happens to several users in our organization.

I have Tried the following, still the issue remains :

  • Reinstalling Teams
  • Clearing Teams cache
  • Repairing Office
  • Enabling/Disabling the Add-in



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Microsoft Teams
A Microsoft customizable chat-based workspace.
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Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Yuki Sun-MSFT 40,871 Reputation points

    Hi @IBN ,

    For the affected users, please follow the steps below and see if it can help:

    1. Close both Outlook and Teams.
    2. Uninstall Microsoft Teams and Teams Machine-Wide Installer from Control Panel.
    3. Navigate to %localappdata%\Microsoft, delete the folders: SquirrelTemp, Teams, TeamsMeetingAddin and TeamsPresenceAddin:
    4. Download and re-install Microsoft Teams.

    In case the issue persists, it's suggested to add the registry key below for the problematic users:
    (Important: Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.)

    Location: Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Resiliency\DoNotDisableAddinList
    Value Name: TeamsAddin.Connect
    Value: 1(DWORD 32 bit)

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