I have just installed thunderbird and am in the process of transfering .eml files into various folders that I have set up. Everything seems to be working fine except that sometimes a file is transferred and it is unnecessary or old or irrelevant to me. When I try to delete the file it refuses to delete - stays in the message list. It also will not respond to a move or any other command...it's like "frozen". How do I get rid of (or perform any action on) a file like this? And, why is this happening? Thanks!