What is the method to the madness of the thread icons? I get the moved icon, and the one with the lock on it for closed threads, but what about the closed envelope and the open envelope. I don’t see any correlation with number of replies, etc. Just curious.
The open envelope means the thread was updated since you last accessed the board. The closed envelope means the thread was not updated. You probably don’t have the threads sorted by last post. When you do this, it becomes obvious.
This is complicated somewhat because the way the board determines when a user last accessed it is not perfect and may not agree with a user’s idea of that.
A quick scroll to the bottom of the thread list page will refresh your memory if you ever forget which icons mean what.