So i just found https://sogo.nu/bugs/view.php?id=522

I did not know it works that way, but i see why you dit it that way.

But now please explain to a "dumb" user with absolutely no interest/understanding in the inner workings of this program why a unread count only works on some folders and not on all..

Also there are problems with this solution. When i move mails into subfolders for later handling, i see that unread count update. On the next day when i open sogo, that unread counter will not display.

This is just not the way this should work / is expected to work.

The current behavior is explained here: https://sogo.nu/bugs/view.php?id=2776#c7118

New message count is only shown always for Inbox and all Folders where emails are moved to by sieve scripts defined from SOGo.
All others are only checked and displayed, if you opend them once in your current session.

As I control most filters from SOGo it isn't a big issue for me, but SOGo isn't aware of all filters (ex: a global spam filter which move "spam" to the "Junk" folder).

I'm not sure what the ideal solution is, maybe we could show unread count as default for the default folders (Sent, Draft, Junk, Trash) or/and add a option to control the behavior.

I get this is done for performance-reasons on big deployments.
But as many bugreports mention, it is not the way this is expected to work. And it is not the way it works in any other mailclient.

Please give me a serverside setting to change the behavior, so it shows the unread count on every visible folder.

This bug/"feature" is one of the last holdback for me to not switch over to v3.