Hello, I got my organization up and running with Thunderbird several months ago and we've been very happily using it until about a week ago-- We're now encountering an issue in which messages will no longer copy to the sent folder -- the "Copying message to sent folder" progress bar hangs forever, until closed, and then it says there was "An error copying message to sent folder". I have read multiple bug reports but most say the issue lies with the server settings. We several imap (server- media temple) accounts linked to thunderbird, and all are experiencing this problem. On my personal computer, however, I am not experiencing this issue, although the server settings are identical. This problem began about a week ago. At the same time, thunderbird seems to have stopped allowing us to move messages from our inboxes to our imap folders -- neither click and drag, nor Message-->Move To will allow us to move messages. It will also not allow us to delete messages. I am running Thunderbird 24.4.0, on mac os 10.6.8. In the interim, I'm having Thunderbird BCC copies of sent messages rather than storing in the sent folder, but this won't work as a long term solution. Any help would be very very much appreciated! Thanks in advance, Jesse and Pistils Nursery