¬Account1
   ¬Account2
   ¬Account3
   ¬Account4

   ¬Business
           ¬Account1
           ¬Account2
   ¬Personal
           ¬Account3
           ¬Account4

I manage 9 email accounts in Thunderbird. Some are for business, some personal and some are literally just set up to receive automated email alerts. I have a unified inbox which displays new email for all those accounts. If possible I'd like to divide that inbox into categories, for example so I can just view the business emails at one time. Currently the hierarchy looks like this and I can click on "Inbox" to view all new mail in all accounts: Inbox ¬Account1 ¬Account2 ¬Account3 ¬Account4 I'd like it to look like this, and to be able to click on "business" or "personal" and view all emails from just those accounts: Inbox ¬Business ¬Account1 ¬Account2 ¬Personal ¬Account3 ¬Account4 Is this possible?