User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; fr; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3 Build Identifier: version 2.0.0.0 (20070326) I have all my accounts incoming in a local inbox folder. So far so good. If I receive a mail with a big attachement (>3Mo), I can forward it (then a copy gets correctly to Sent folder), I can also delete it (then it goes correctly to the Bin). However if I try to drag and drop it to one of my personnal subfolders then one can see that the software takes a short time to do it but that once this subfolder is listed the mail is loss, there is no reference about it anymore. Reproducible: Always Steps to Reproduce: 1. Receive a mail with a big attachement in the local inbox 2. Move it to a local personnal subfolder 3. Mail is lost Actual Results: Mail is lost Expected Results: Mail should be moved correctly to subfolder

Are you using a POP3 or IMAP server? If it is POP3 you should have a look inside the local MBOX file. You can find it inside %profile%/mail/%account%/%folder%. Open the file without the extension. Is your message listed there? If yes what tells the X-Mozilla-Status and X-Mozilla-Status2? Try to delete the appropriate .msf file so the index will be rebuilt. Can you see your message again? David, could this be related or a dupe of bug 368112?

i guess its a dupe. Its the same reported on Bug 378016 Roelly: you can also use the rebuild index feature in Thunderbird 2 ( -> right mouse click on the folders name -> properties -> Rebuild index), instead of deleting the .msf files manually

dupe of bug 323866

dup - please try today's 2.0 nightly build