OK, I also manually move stuff, sometimes, usually the Trash! I guess it's not always possible to set a time for that kind of event ie; 1 month, 1 year, etc. I'm still confused (by my never having used Thunderbird), as to how you know if
current mail has been filtered to a mailbox/folder that is not 'open' to view. It probably doesn't really work that way, there must be some indication that there is an unread message in the folders in view, even if it's in a subfolder that is not in view.
I could possibly do the time thing, but some things need to be archived right away, others in a few months, and others I keep in the main folder for over a year until the issue is resolved.
I know there's unread mail in a folder/mailbox because the name of the folder/mailbox shows up in
, just like Apple Mail (if I'm remembering correctly). The only difference is now there's an asterisk if the main folder has a sub-folder. My understanding is that the asterisk has been there for a few upgrades for most users, but for some users (that would be me) the asterisk just showed up with the latest upgrade.