I have two email accounts configured, GMail and Exchange. There are times when I have a notification for Exchange, but don't have any unread mail. During my work day I read my mail at work through outlook, at the end of the day I sometimes have these orphaned notifications, it's like mail came in on that account at some point, and aquamail properly gave a notification, but at some point I read that mail on my computer, but on the next poll, the mail is gone from the server, so, nothing for me to read, yet the notification remains. I don't have the same problem with my GMail account.
