Unified folders not working with version 115. WORKAROUND: delete the "smart mailboxes" folders
Unified Folders in Thunderbird 115 for mac no longer works. Useless! Computer Tech specialist here and have been using Thunderbird for ages. With this latest version, the inbox, sent, etc etc etc no longer display as unified. The Unified Folders category when ON shows as its own item in the left column with a single empty inbox! Scrolling up and down to each account for each subfolder is a waste of time!!! Hope you fix this ASAP!!!!! Unified folders works fine in 10.12.13 but I cannot got back to that due to your system.
Modified
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AHA - I figured out the solution for the Unified Folders feature no longer working after updating to Thunderbird 115 from 10.12.13 on Mac.
1. Quit Thunderbird if it's running. 2. Open a new Finder window on your Mac. Go to your user home (lil' house icon), hold the Option key on your keyboard then go to the top menu bar to GO and drop down to Library and click to show the hidden user Library .If your Library is already unhidden in your user home, simply select it. 3. Go down to Thunderbird, select it, then select Profiles and choose your default profile. 4. Go down to Mail, select, and delete the "smart mailboxes" folders showing there. You might want to move them to a separate folder in your computer temporarily to be safe before deleting. 5. Re-open Thunderbird and, if Unified Folders was already selected you should see them again. If Unified Folders is not at the top of the column, click the three buttons to the right of Unified Folders and choose to "Move Up." 6. If Unified Folders is not showing, go to View in the top menu bar to VIew down to Folders and select Unified Folders. You can deselect "All Folders" if you wish.
Modified
I have a similar problem after upgrading to Thunderbird version 115 on Linux (Arch Linux)
There is slight difference from above though.
I have configured 3 Yahoo accounts (All IMAP), 4-5 Gmail accounts (IMAP) and 1 Hotmail account (IMAP)
It shows Inbox, Sent, Drafts and Archives, all as Unified folders correctly.
But in case of all three Yahoo accounts it does not Show the "Bulk Mail" folder under Junk unified folder.
Infact it does not show them at all - not even under Yahoo account which is shown after all Unified folders. (in left pane)
If I disable Unified folders then Bulk Mail appears under Yahoo account along with all other Yahoo folders.
Everything was fine before upgrading to Thunderbird version 115
Modified
Ok I found this solution to my above problem here:
How do I get the Unified Junk folder to display messages in Sub Folders
For anyone still having general issues with Unified Folders, please check 115.3.0 and post your results.