I am a very long-time Thunderbird user. I store my e-mails in many folders, and in all folders I have the unread highlighted. In my primary, very large inbox, the total number and the number of unread messages are normally displayed, and in the message list, the unread are highlighted. I was using a filter for something else totally unrelated, and suddenly I began seeing only total e-mail number, and the unread are no longer highlighted. The unread are still highlighted in my other folders. Is there some way to get the unread messages in my primary inbox marked again? Otherwise I often don't know which to read. I'm talking about thousands of messages, not just a few! Thank you.