This happened recently -- I think after i migrated all past emails from an old PC to my new laptop (Win 10). On my TB, I have 5 different email addresses. On one of these, I recently noticed that all old messages had been deleted. I put this down to an error on my part. But lately, immediately after I read an email sent to this address, that email just disappears. I mean disappears. Not put into Junk or Trash. Just disappears. I have tested this process by sending an email from another of my addresses to the affected address. The email comes in, it allows me to open it. But once I close the message and select another mail folder, the message disappears. Going on an old thread to this forum, I check to see if this email account had some config option checked to do this. But I see no such config option, let alone it being selected. This is goosing me. I'm on TB 52.1.1 (32-bit). I tried getting a 64-bit TB but could not.