I’m using both Thunderbird 31.0 beta and 24.6.0 on OSX 10.9.3 and when I move a message from my IMAP inbox to my local folders, the message at first appears to be moved. 1) It disappears from the inbox folder display and 2) It is copied into my local folder However, if I look in the IMAP trash folder the message is not there. When I go back to the IMAP inbox folder, the message reappears there. (It will also reappear if I simply refresh the IMAP inbox folder after moving the message). If I delete the message from my IMAP inbox folder, it is correctly moved from my IMAP inbox folder to the IMAP trash folder, which is how I have my server settings delete options configured. Changing the server settings delete options doesn't affect the problem when moving messages. Additionally, my local mail folders are configured as maildir, not mbox. (Not sure if that's relevant info..) Thinking it may be something specific to my primary IMAP server, I tested moving messages from IMAP folders to my local folders with the Gmail IMAP server. Doing so the moved message appeared to be deleted on the IMAP folder, (the messages are always correctly copied to my local folders). Checked back immediately and the message appeared to have been removed from the IMAP folder. However, after waiting for a longer period of time, (about 30 minutes), the moved message had eventually reappeared back in my Gmail IMAP folders, (I've tried it on several different IMAP folders). So I'm seeing this behavior trying to move email messages from my IMAP folders to my local folders using Thunderbird 24.6.0 and 31.0. The messages get copied correctly to my local folders and initially disappear from the IMAP folders, but eventually they reappear there.