Yesterday i stumbled across something odd. Did not see the M365 Groups in Outlook for Windows anymore. They seem to be gone in the newest Version.
Let's start at the beginning. Office in the Current Channel
Outlook Profile is set up with Cached Mode (without Chached Mode you don't see the M365 Groups either).
As you can see the Groups are listed here
The cached Files are stored in C:\Users\<Username>\AppData\Local\Microsoft\Outlook
As you can see the *.nst File is here. It is the offline Cache for M365 Groups - similar to the *.ost for the Mailbox.
Another Computer with current Channel Preview
Missing the M365 Groups in the Folders
The cached Files are stored in C:\Users\<Username>\AppData\Local\Microsoft\Outlook.
But here i only see *.ost Files - no *.nst available
In Outlook on the Web the Groups are still there
Not long ago, Microsoft have enabled Folders and Rules for M365 Groups.
Looks to me that Outlook for Windows will dump the Groups. What do you think?