A suggestion:: - click to the account's 'server settings' pane - check the folder named at 'Local Directory' - use the dropdown menu to select the one you want, probably the imap.server.com without the -n number - restart thunderbird and recheck the local directory. If the folders populate, you can then delete the other folders.

The good news with IMAP is that the messages remain on the server and Thunderbird will repopulate if the PC folders are deleted.

Thanks, This may be a macOS GUI difference but in the Local Folder setting I see: - {Folder hierarchy}/imap.server-5.com - No dropdown - There is a Browse button that takes me to Finder at the imap.server-5.com folder

Do you mean to use Browse to select imap-server.com and then restart?

I have a tendency to put my foot in mouth whenever I attempt to help a MAC issue; I keep thinking thunderbird is the same everywhere. My perception was that your IMAP account was pointing to a server other than the intended, assuming the account's proper name was your example without the numbers. My primary intent was in sharing that, if you remove all of the message folders in IMAP, thunderbird will repopulate. Since the perception is that there is duplication, the result after repopulating would be less disk used. If you posted a screenshot of the imapmail\<imap account> folder, that might make a response clearer.

Ah, I see. I think I can live with this duplication/replication. I found it while doing a disk profile to see what was taking space. If I see more large folders popping up in the future, I can revisit.

Thanks for your prompt responses.

I am hoping my response proves useful. Good luck. :)

Definitely does help. Often it helps to know when to tweak and when to just let the software do its thing. I think this is the latter.