This has happened since Supernova. The previous versions also had count problems, but different patterns. I ask for new mail, and see folder pane counts unrelated to the actual local folder. Almost always fewer, often only one of a dozen new messages shown. The bright unread folder pane icon and highlighted message title seemingly never apply to more than one message. It is rarely the newest message, sometimes randomly in the middle, often the oldest message. The one account which is set to only manual checking never shows a count or unread highlight for manual checking. Only if it happens to find something on a restart of TBird. This seems unrelated to the "total message count" option. Enabling that shows all the messages still on the servers, not the counts stored locally. Would be nice to know if there are unread messages in a local folder without having to click on each one...