GET RID OF NEW OUTLOOK NOW - Revert To Classic PLEASE

THEY SCREWED UP MY WHOLE EMAIL CAN'T REVERT BACK!!!!!!

Please see these articles, they should help:

Use Classic Outlook, not New Outlook

You can't open classic Outlook on a new Windows PC - Microsoft Support

Dear Pabmarc

Good day! Thank you for posting in the Microsoft Community. We'll be happy to help!

First of all, we regret for the inconvenience caused to your work. Based on your description, I have a general understanding of your question, please kindly refer to following:

1. Open Outlook.
2. Navigate to the Outlook menu.
3. Uncheck the option for the New Outlook.
4. Click the Revert button.
5. Allow the application to revert to the Outlook Classic view.

For your reference: **** Toggle out of the new Outlook for Windows preview - Microsoft Support

If you don't see a toggle in the new Outlook for Windows, please kindly troubleshoot with these steps:

1. Launch classic Outlook for Windows from the Windows Start Menu, not the new Outlook (identified by the "New" tag).
2. Open the Registry Editor by typing "Registry Editor" in the Start Menu search and selecting the app.
3. Go to Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences.
4. Find and double-click on "UseNewOutlook" at the bottom of the list.
5. Set the Value Data field to 0.
6. Attempt to launch classic Outlook for Windows from the Windows Start Menu.

Meanwhile, if you still need further help, then please kindly share more details about your issue with me so that I can do more research and tests, thanks.

Thank you in advance for your understanding. Your patience and cooperation will be greatly appreciated. I hope for all the best!

Sincerely

Kerry Chen | Community Moderator

"\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences"

Key does not exist and toggle button on Outlook menu isn't there. Now how do I import an existing pst???

I've installed MS Office 365. Word, Excel, and PowerPoint work fine. Outlook (NEW) is the only option that appears. When it tries to set up, it fails with both of my accounts. OWA works fine for both.

Here's the error I receive:

{"SessionId":"fad3aaf5-7071-e142-a030-98d2b3c0838c","Timestamp":1741887044756,"Error":"UNKNOWN undefined"}

I've tried repairing MS Office 365 and Outlook (New) as well as reset.

Mail does not appear as an option in the Control Panel and the registry change to Outlook Classic, as suggested, does not exist. There's no Outlook Preferences. This is a real stumper. I've never not been able to install Outlook.

Please advise.

Please see these articles, they should help:

Use Classic Outlook, not New Outlook

You can't open classic Outlook on a new Windows PC - Microsoft Support