How do I stop the new Outlook from opening?

Question

How do I stop the new Outlook from opening?

Alec Crow 0

I want to stop the new Outlook from opening when I open Outlook.

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Alec Crow 0 Reputation points

2025-12-30T02:42:32.3766667+00:00

I have a new Windows 11 laptop. I want to stop new Outlook from opening when I open the Outlook app.
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2 answers

Alec Crow 0 Reputation points

2025-12-30T02:42:32.3766667+00:00

I have a new Windows 11 laptop. I want to stop new Outlook from opening when I open the Outlook app.
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.

Answer 1

To stop the new Outlook from opening when you launch Outlook, you can manage the installation settings through Windows Registry or PowerShell commands, depending on your version of Windows.

For Windows 11:

Remove the new Outlook app: You can use the following PowerShell command to remove the new Outlook app package:
```
   Remove-AppxProvisionedPackage -AllUsers -Online -PackageName (Get-AppxPackage Microsoft.OutlookForWindows).PackageFullName
```
After removal, Windows updates won't reinstall the new Outlook.
Registry Modification: Additionally, you might need to remove a specific registry value to prevent the new Outlook from being installed again:
```
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsUpdate\Orchestrator\UScheduler_Oobe\OutlookUpdate
```

For Windows 10:

Registry Setting: To prevent the new Outlook from being installed, add the following registry value:
```
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsUpdate\Orchestrator\UScheduler_Oobe
```
Then create a REG_SZ setting named BlockedOobeUpdaters with a value of ["MS_Outlook"].
Remove the app package: If it has already been installed, use the PowerShell command mentioned above to remove it.

These steps should help you manage the new Outlook's behavior on your system.

Answer 2

Darren-Ng 12,775 Microsoft External Staff Moderator

Dear @Alec Crow,

Thank you for posting your question in the Microsoft Q&A forum.

Based on your description, you want to stop the New Outlook from opening automatically on your Windows 11 laptop and prefer to use the classic Outlook instead.

Here are some suggestions you can try:

Turn off “New Outlook” switch

Open New Outlook (the one that opens automatically).
In the top-right corner, turn off the switch labeled: “New Outlook”
Outlook will close automatically and reopen in Classic Outlook.
After this, every time you open Outlook, it will open the Classic version, not the new one.

Resets Outlook’s startup preference

Close Outlook completely.
Press Windows + R, type:
```
  outlook.exe /firstrun
```
Press Enter.
This resets Outlook’s startup preference and brings back the Classic Outlook prompt.

If you have tried all the methods above but still cannot resolve the issue, try to uninstall app then reinstall it

Open Settings > Apps > Installed apps
Find Outlook (new)
Click Uninstall

This will NOT remove Classic Outlook. Classic Outlook stays installed as part of Microsoft 365.

Opening Outlook from: Desktop shortcut > Start menu > Taskbar pinned icon

it will open Classic Outlook, not the new version.

I hope information above helpful, if you have any other questions, please feel free to reach out.

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Darren-Ng 12,775 Reputation points Microsoft External Staff Moderator

2025-12-31T05:52:58.7933333+00:00

Dear @Alec Crow,

Just checking in to see if the above information was helpful. If you have any further updates on this issue, please feel free to post back. If you think my reply is helpful to you, please remember to mark it as an answer. Warm thanks.
Mailman, Richard Bernard 5 Reputation points

2026-08-18T13:20:31.3833333+00:00
On my new PC, it opens to new Outlook every time even after I set the new Outlook toggle to OFF.

The outlook.exe /firstrun now is offered as unknown option

Another suggestion I had seen about File,Options did not have the stated preference available at the bottom of that tab.

All of the suggestions from AI within Office do not work (although I haven't yet had courage to go into registry until I do a system backup.

It would be really helpful if there was some AI or human curating of the MS Q&A -- I am sure the info was correct but MS changes things without any heads up all of the time. I am still reprogramming all of the shortcuts that used to work consistently across office apps and now do not. After a half-century of being an advocate for technology (and MS), it gives me great sympathy for the curmudgeons who resent the advent of technology. I know you'll probably never read this but at least I could vent.

outlook.exe /firstrun
Hornblower409 16,350 Reputation points

2026-08-19T05:29:56.7166667+00:00

@Mailman, Richard Bernard said

On my new PC, it opens to new Outlook every time even after I set the new Outlook toggle to OFF. ... I haven't yet had courage to go into registry until I do a system backup.

If the Toggle in New Outlook doesn't work, the registry change is the next thing to try.

https://support.microsoft.com/en-us/office/toggle-out-of-the-new-outlook-for-windows-ec102b39-5727-418e-ae1f-a1805434640c

If you prefer a pre-built .reg file, see:
[External Non-Microsoft Site] https://www.slipstick.com/outlook/classic-outlook-not-new-outlook/

The outlook.exe /firstrun now is offered as unknown option

The instructions in this thread are from almost a year ago. New Outlook is still changing.

If none of this help, you need to start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem.

This provides much higher visibility to your issue than adding on to an old post, which is only seen by people who are already following this question.
Mailman, Richard Bernard 5 Reputation points

2026-08-21T20:23:19.5266667+00:00

Well, I also had done the registry change and that made no difference. In my apps list was only one Outlook and it opened always to new Outlook. I finally was able to just create a shortcut to Outlook Classic and use that to start Outlook (I delete all shortcuts to Outlook New ) so it is a work-around. On two other PCs I used, using the select toggle on the upper right hand corner works, but not on this new PC. I tried to delete Outlook New but the uninstall of Office allows only deleting everything. I wasted an inordinate amount of time that was unnecessary. When there are two versions, on installation one should be given the option to take one or the other (or both); same on uninstalling. This and other things like changing long-standing keyboard shortcuts or macro handling without notice have turned me from a Microsoft fanboy to sticking needles in my old DOS floppy disks. Anyway, thanks for all of the responses.