My friend is a "beginner", using same Eudora as I have, 4.3. She has made additional mailboxes but just discovered that one is empty, regardless of the fact that she has transferred messages there. She did a test--transferred one to her "to do" box and saw it appear there, then one to her "save" box and saw it disappear. Where could they go and why? She said she looked in Trash and it wasn't there. It has always worked for me. Sylvia G.