<p>I noticed that the last couple of years messages from one folder were missing. My fix: I knew some text that would be in the most recent missing email, so I searched the MAIL\username folder for that text using Agent Ransack. This identified a PMI/PMM pair that held the missing emails. They had a different filename from the current truncated files. I closed Mercury and concatenated the files together, via the good old 'copy /b' DOS method. Starting Mercury again and looking at the folder with 'eM Client', I see the messages now exist, but only the Date column is correct, not message content. Then I tried mxmaint_ui.exe - A 'Check' showed invalid index numbering or something. A 'Repair' completed with a not-too-scary warning. Starting Mercury again, then eM Client..... all my messages are there!!! (Just had to mark some as read). Hope this can help anyone else who strikes the same problem. </p>