Version:            (using KDE KDE 3.5.5)
Installed from:    Debian testing/unstable Packages

Contents of messages (emails) in KMail that were previoulsy displayed and saved correctly disappear. The subject of the message changes to "No Subject" and the date and sender of the message to "unknown". Information about the email, like if it has been answered, if it has a signature (GPG, etc) or if I have replied to it, remain (you can still see the corresponding icons in front of the message in KMail's list view). The size of the message changes to something around "98 B".

This seems to be irregardless of the way the messages were received (be it IMAP, POP or something else) and independent of the kind of message or the file system the mailbox is on (ext2 on one computer and ext3 on another one for me). Restarting KMail does not help. I still an entries for those mails in KMail's list view but the contents of the message is gone.  Mutt shows those messages as empty, too.

This error seems to occur a large bunch of messages get moved around or when you change KMail's folder structure und "Local Folders" (from inside KMail).

I have lost a bunch of messages that were pretty important to me as I hadn't seen the need to make an external copy of all my important emails when I got a "Saved" Folder for that purpose in KMail. So, I'm pretty upset with KMail and I hope this bug won't be taken lightly.