I have set View-Folders to Unified. This shows single Junk folder with Accounts name as its sub-folders. The Left side pane listing is somewhat like this: Junk - GMAccount1 - GMAccount2 All accounts are IMAP accounts. I also have Yahoo IMAP account where Junk folder is named as Bulk Mail. By default thunderbird does not consider it as Junk folder so what I do is: 1) Right click on top-level unified junk folder and go to properties 2) Under "Select the folders to search" I manually add Yahoo accounts Bulk Mail folder. After adding I expect that, the left hand side listing would become: Junk - GMAccount1 - GMAccount2 - YahooAccountName But it does not show YahooAccount as a subfolder. (Even after restarting thunderbird) But surprisingly, when I click on top level unified junk folder, then it shows the e-mails in "Bulk Mail" in the right hand side pane. Which means there is a minor display bug which does not display the folders included in Unified folder. Please let me know if there is right solution or please correct the bug. Thank you.