We have 5 PCs in 1 network. All use 1 mail address. 2 PC use MS Outlook, 3 use Thunderbird. All the clients are set to IMAP. If somebody flags a mail in - inbox/incoming folder - with a star or give it an important , etc. tag, after a couple of minutes, TB automatically moves that mail to TRASH. Folder repair solves the problem, but only for a couple of hours. This error does not appear in PCs using MS Outlook, but those has that mail at inbox and trash also. If anybody has a solution for this, we will be very grateful!