How do I prevent Outlook 365 on the Mac from launching the New Version

wow JFSSS. to the point. Unfortunately MS does not care.

I fully agree with all the posts that MS is absolutely deaf and dumb regarding how they write software for Mac and MS is obtuse to the obvious need for user friendly software, in particular, forcing consumers to use inferior, unwanted products like MS Outlook.

MS must improve Outlook by:

1. Guaranteeing the ease of migrating all of a users folders and files as the user has organized in their Legacy Outlook;
2. Not force consumers to use a product they have rejected;
3. Allowing users to easily return to Legacy while maintaining the original consumers organization of their email, folders, contacts, calendars, etc;
4. Allowing ease of Importing from the consumers Main Identity as MS once did so efficiently;
5. Allow the use of Rules.
6. Allow the Retrieval of Sent Email.

Anything less is inexcusable. Microsoft's Customer Care and Customer Service is the worst in the business. One should be able to make a phone call to a mutual-billion dollar company and receive instant in-person experienced technical support for free. The caps are for emphasis and not yelling: IF MICROSOFT DOES NOT MEET CONSUMERS NEEDS AS EXPRESSED ABOVE, THEN ALL APPLE USERS NEED TO ABANDON MICROSOFT OUTLOOK and use Apple Mail. MS Outlook has NO VALUE in its current "New Outlook" Form. For MS "New" means "Old and Neanderthal"

Yes this worked for me but try at your own risk. This is a Microsoft product after all.

The reason I don't like the new version is that it won't let Mac users all the filter for emails especially Categories. I use this all the time to organise which emails have been actioned but the new version won't let you select it to filter. This has been reporting as feedback into the black hole of Microsoft support.

Adding to this thread. This new version is not Mac friendly - it automatically downloaded and I lost all ability to reply to emails, accept calendar invites or forward calendar functions. Eventually I discovered that I could revert to the legacy version which I did. I've since been forced to update twice and both times had to switch back to the original version.
Please can this have an opt out function rather than a forced update

run the code mentioned earlier in this post. it stopped it for me.

Adding to this thread. This new version is not Mac friendly - it automatically downloaded and I lost all ability to reply to emails, accept calendar invites or forward calendar functions. Eventually I discovered that I could revert to the legacy version which I did. I've since been forced to update twice and both times had to switch back to the original version.
Please can this have an opt out function rather than a forced update