How to permanently prevent Outlook for Mac from switching to the new GUI?

I did the terminal thing and it worked like a charm. Thanks! :)

I very much encountered the same experience and DO NOT WANT the 'New Outlook for Mac' as it is now.

I tried it twice and suffered to find my way in it, lacking possibilities en functionality. I also do not want to be in a 'development procedure' to help Microsoft; I paid a 365 subscription in able to do my work and to do what I want to do; don't want and need to spend time in developing a 'new' product from them.

I now seriously consider to make a complete switch to the Mac office suite and mail program.... sometjing that was advised me long ago when I switched to Mac....

So please Microsoft; make my life easy and don't cause new trouble; let me work with the Outlook as it is now. Let me now when your 'new' version is up to the current one.

Thank you

Thank you very much; this worked like a charm; an immediate fix! I am very happy to be able to continue using my good 'ol Outlook :-)

Quit Outlook, open Terminal. Copy the following line, paste it into the Terminal window, and press enter.

defaults write com.microsoft.Outlook EnableNewOutlook -int 0

You'll be taken back to the standard prompt, but once you launch Outlook again, you should no longer see the 'New Outlook button and won't be prompted to switch.

Hi, I am also in the same boat as all of you needing to keep the previous version of Outlook to be able to run our business and access old emails/files etc. What a nightmare this is!!!! I have been avoiding switching bc when I tried it I lost so much that i still needed. Then this week I got the dreaded "new version will launch the next time Outlook restarts" and then found this thread.

I have tried to enter the: defaults write com.microsoft.Outlook EnableNewOutlook -int 0 (*by jwcjcjwc on page 3)

into Terminal on Big Sur but it doesn't change anything, I still have the banner and new outlook toggle.

Please help I don't want to get stuck on the new crappy Outlook!!!

BTW It said this at the top of the terminal: (do I need to do this first?) I don't know what i am doing really with terminal:

The default interactive shell is now zsh.

To update your account to use zsh, please run chsh -s /bin/zsh.

For more details, please visit https://support.apple.com/kb/HT208050.

1. I put in below (with my name ------ out here only)

kristentsMBP401:~ k------$ defaults write com.microsoft.Outlook EnableNewOutlook-int0

2023-11-10 01:29:38.112 defaults[41929:100684616]

Rep argument is not a dictionary

Defaults have not been changed.

kristentsMBP401:~ k-------$

2. Then I tried again and Latest try gave me this:

kristentsMBP401:~ k-----$ defaults write com.microsoft.Outlook EnableNewOutlook -int 0

kristentsMBP401:~ k-----$

still the new outlook relaunch threat banner is there

Thank you in advance! I guess I will also be finding a new system to use in the future and leave outlook unless they address our valid concerns!

** update I saw in a another thread that I need to quit outlook, then put the code in terminal and then restart Outlook. How do I know if I did the default I already did with Outlook open was done right from what I did above?

2. Then I tried again and Latest try gave me this:

kristentsMBP401:~ k-----$ defaults write com.microsoft.Outlook EnableNewOutlook -int 0

kristentsMBP401:~ k-----$

Or do I need to quit Outlook and then do the default write again. So confused and afraid to quit outlook bc if I did this wrong the new outlook will automatically open. Yikes!