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The Teams integration works differently depending on which Outlook you have. In new Outlook for Windows, Teams scheduling is built in and there is no separate COM add-in to install. In classic Outlook for Windows, the integration is the Microsoft Teams Meeting Add-in for Microsoft Office, installed by the Teams desktop app.
Use the section that matches your Outlook version rather than installing a random Outlook add-in from the web or Microsoft AppSource.
Identify your Outlook version
| Outlook version | How Teams integration works | What to install |
|---|---|---|
| New Outlook for Windows | A native Teams meeting toggle appears in the event window. | New Teams desktop app; no COM add-in. |
| Classic Outlook for Windows | A COM add-in adds New Teams Meeting to the Calendar ribbon. | Teams desktop app and its Teams Meeting Add-in. |
| Outlook for Mac, web, iOS, or Android | Teams integration is built into the supported meeting or event experience. | No Windows COM add-in. |
In classic Outlook, check the title bar or File > Office Account. If Outlook shows a Try the new Outlook switch, you are using classic Outlook. New Outlook has a different interface and does not support the classic COM add-in.
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Before installing
Make sure these conditions are met:
- The Teams desktop app is installed on the same Windows computer as Outlook. The Teams website alone cannot install the Outlook add-in.
- Teams and Outlook are signed in with the same Microsoft 365 work or school account.
- Your organization uses Exchange Online or another supported Microsoft 365 business mailbox.
- Neither Outlook nor Teams is being run as administrator. Running one elevated and the other normally can prevent the integration from loading.
- Classic Outlook is Outlook 2016 or later and has current updates.
Personal Outlook.com, Hotmail, MSN, Gmail, Yahoo, iCloud, and other POP or IMAP accounts may not support creating Teams meetings through the classic Outlook add-in.
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Install Teams integration in new Outlook
There is no separate Teams COM add-in for new Outlook. Install or update the Teams desktop app, then restart both applications.
- Close Outlook.
- Right-click the Teams icon in the Windows notification area and select Quit Teams.
- Start Teams and sign in to the same work or school account used by Outlook.
- Start Outlook again.
- Select Calendar > New event and look for the Teams meeting toggle or meeting option.
If the toggle is still missing, confirm that you are not signed into Teams with a personal account while Outlook uses your business account. Also check that your organization has not disabled Teams meeting scheduling.
Install the Teams add-in in classic Outlook
Method 1: Enable an installed add-in
The add-in may already be installed but disabled by Outlook.
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- Open classic Outlook.
- Select File > Options > Add-ins.
- Look for Microsoft Teams Meeting Add-in for Microsoft Office.
- If it is under Disabled Application Add-ins, select COM Add-ins in the Manage box at the bottom of the window.
- Select Go, tick Microsoft Teams Meeting Add-in for Microsoft Office, and select OK.
- Close and restart Outlook.
Open Calendar. The ribbon should now contain New Teams Meeting. If Outlook disabled the add-in again, return to File > Options > Add-ins and check both the active and disabled sections. Outlook can disable COM add-ins after detecting startup or performance problems.
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Method 2: Reinstall it from new Teams
This is the normal repair method when the add-in disappeared after Teams changed from the classic client to new Teams.
- Close Outlook.
- Quit Teams from the notification area: right-click the Teams icon and select Quit Teams.
- Open Start > Settings > Apps > Installed apps.
- Search for Teams Meeting Add-in.
- If it appears, select its three-dot menu and choose Uninstall.
- Start new Teams and sign in.
- Wait for Teams Meeting Add-in to appear again under Installed apps.
- Restart Outlook and check Calendar > New Teams Meeting.
Do not reinstall all of Office as the first step. The add-in is managed by the Teams desktop client, so removing the Teams Meeting Add-in and restarting Teams is the documented repair path.
If the add-in is not listed in Installed apps
Microsoft provides cleanup PowerShell scripts for installations that do not appear normally. Close Outlook, quit Teams, and follow Microsoft’s current Teams add-in troubleshooting article to download the applicable script. Microsoft distinguishes between installations with version numbers beginning with 1.23 and newer versions:
- Use
UninstallOldTMA.ps1if no add-in is listed or the installed version begins with1.23. This script requires an elevated PowerShell window. - Use
UninstallTMA.ps1if the installed version does not begin with1.23. Microsoft’s procedure runs this from a regular PowerShell window.
After the script finishes, start Teams, wait for the add-in to be installed again, and restart Outlook. Use Microsoft’s supplied scripts rather than copying an unverified script from a forum.
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Use the Teams add-in in classic Outlook
- Open Outlook > Calendar.
- Select New Teams Meeting on the Home ribbon, or open a new meeting and select Teams Meeting.
- Add attendees in the To field.
- Set the date, start time, end time, and time zone.
- Add a subject and any agenda or instructions.
- Confirm that the Teams meeting details have been inserted into the invitation.
- Select Send.
The invitation normally includes a Join Microsoft Teams Meeting link, meeting ID, passcode, and available dial-in information. To remove Teams from an appointment, select the Teams meeting control again or delete the Teams meeting details before sending.
For a recurring meeting, select Make Recurring before sending. Teams meeting options—such as who can bypass the lobby or present—can usually be changed from the meeting link or in Teams after the invitation is created.
Manually register the add-in DLL
Use this advanced procedure only when reinstalling through Teams has failed. It is best performed with IT assistance.
- Close Outlook and Teams completely.
- In File Explorer, open
%LocalAppData%MicrosoftTeamsMeetingAddin. - Open the highest-build, version-numbered folder, such as
1.0.23334.11. - Open an elevated Command Prompt.
- Run the command matching the architecture of Office, not necessarily the architecture of Windows.
For 64-bit Office, run:
%SystemRoot%System32regsvr32.exe /n /i:user "%LocalAppData%MicrosoftTeamsMeetingAddin1.0.23334.11x64Microsoft.Teams.AddinLoader.dll"For 32-bit Office on 64-bit Windows, run:
%SystemRoot%SysWOW64regsvr32.exe /n /i:user "%LocalAppData%MicrosoftTeamsMeetingAddin1.0.23334.11x86Microsoft.Teams.AddinLoader.dll"Replace 1.0.23334.11 with the version folder on your computer. Then restart Teams, sign out and back in, and restart Outlook. Outlook should not be running as administrator.
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Check the registry load setting
If the add-in is installed and registered but does not load, check its Outlook load setting:
- Press Windows key + R, type
regedit, and press Enter. - Go to
HKEY_CURRENT_USERSOFTWAREMicrosoftOfficeOutlookAddinsTeamsAddin.FastConnect. - Check the
LoadBehaviorvalue. - Set it to
3if it has another value. - Close Registry Editor and restart Outlook.
Back up the registry before editing it. A company policy can overwrite this setting or block the add-in entirely. Relevant policy locations include HKEY_CURRENT_USERSOFTWAREPoliciesMicrosoftOffice16.0OutlookSecurity and HKEY_CURRENT_USERSOFTWAREPoliciesMicrosoftCloudOffice16.0OutlookSecurity. Contact your administrator if these policies are managed centrally.
Common problems
| Problem | Likely cause | Action |
|---|---|---|
| No Teams button in new Outlook | The native Teams event option is missing, or accounts do not match. | Quit and restart Teams and Outlook; sign in with the same work or school account. |
| No Teams add-in in classic Outlook | It is disabled, not installed, or Teams is only installed in a browser. | Check COM Add-ins, then reinstall the Teams Meeting Add-in from Installed apps. |
| Add-in keeps disabling itself | Outlook detected a performance problem. | Re-enable it and update Outlook and Teams. Ask IT to check add-in policy if it is disabled again. |
| Meeting details are missing for a delegate | The delegator’s mailbox may be hidden from the Global Address List. | An Exchange administrator can use Set-Mailbox -Identity <delegator’s email address> -HiddenFromAddressListsEnabled $false, then the delegate should restart Outlook and create a new invitation. |
| Outlook crashes or opens in Safe Mode | An Outlook and Teams add-in compatibility issue may be present. | Update classic Outlook. If updating is temporarily impossible, disable the Teams add-in from COM Add-ins. |
Run Microsoft’s troubleshooter
On Windows 10 or later, Microsoft’s Get Help app includes a troubleshooter for the Teams add-in in classic Outlook. Open Microsoft’s Teams add-in troubleshooting page, select Start, choose Open if Windows asks to launch Get Help, and follow the prompts. It is intended for classic Outlook and does not install the COM add-in in new Outlook.
FAQ
Where can I download the Teams add-in for Outlook?
For classic Outlook on Windows, the add-in is installed and managed by the Teams desktop app. It is not normally installed from Microsoft AppSource. For new Outlook, no separate COM add-in is used; Teams meeting scheduling is built in.
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Why is the Teams button missing from Outlook?
In classic Outlook, the Microsoft Teams Meeting Add-in for Microsoft Office may be disabled or missing. Check File > Options > Add-ins, then reinstall Teams Meeting Add-in from Windows Installed apps if necessary. In new Outlook, check for the native Teams meeting toggle and confirm that Teams and Outlook use the same account.
Can I use the Teams Outlook add-in with a Gmail account?
The classic Outlook add-in is intended for supported Microsoft 365 work or school accounts with Exchange. Gmail, Yahoo, iCloud, POP, IMAP, and many personal Outlook.com accounts are not supported for creating Teams meetings through the classic add-in.
Does reinstalling Office reinstall the Teams add-in?
Not reliably. The Teams desktop client manages the Teams Meeting Add-in. Close Outlook, uninstall Teams Meeting Add-in from Windows Installed apps, restart Teams, wait for the component to return, and then restart Outlook.
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Is the classic Teams COM add-in supported in new Outlook?
No. New Outlook does not support the classic COM add-in. Use the Teams meeting option built into the new Outlook event window.
The Bottom Line
For new Outlook, restart Teams and Outlook and use the built-in Teams meeting option. For classic Outlook, first enable Microsoft Teams Meeting Add-in for Microsoft Office; if it is absent, uninstall Teams Meeting Add-in from Windows Installed apps, restart new Teams, and restart Outlook. Manual DLL registration and registry changes are last-resort fixes, not the normal installation method.
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