Message source of Internet mails shows empty in a shared folder.

This is a case when a folder is shared among users from different POs.

If a user from one PO moves an Internet mail into a shared folder, then users from other PO / site will not see an original Mime.822 file. This also causes a Message Source showing empty.

If you open the mail and do File | Attachments | View to display all attachments of the mail, you will notice a Mime.822 showing with an icon that a client uses for "a file not downloaded".