One day after opening Windows Mail (with one POP3 account), all the local storage folders were gone and in their place standard folder structure as when opened for the first time. I had several folders and subfolders created, with several hundred mail stored (passwords, bank statements, auction details etc.). I tried closing and expanding the folder structure, tried searching for the e-mails in the Mail program and on the disk, but nothing.

I then tried to navigate to the folder (C:Users"user"AppDataLocalMicrosoftWindows Live Mail) but inside I only found the standard structure, not my subfolders and mails. Trash is full of even older e-mails (no automatic deleting), no subfolders or e-mails in question there. Inbox for the only account is still with e-mails (some older than the missing ones).

Any guess to what happened and if it can be reversed?