I've got problems with my mail index (in Mail.app) repeatedly becoming corrupted every few months, and messages disappearing. When this happens, I use the EnvelopeIndex removal trick to rebuild it and reclaim my mail, but it's starting to grate. I keep my inbox to a couple dozen messages and I refactor other mailboxes to keep them to reasonable sizes (a few thousand tops; most under 1000) with the exception of Trash and Junk (which is not where messages are disappearing from anyway). I have a total of around 110,000 messages in my mail (and growing, of course). Is this just plain too many for Mail.app to handle? Am I doomed to using Thunderbird or Eudora or *shudder* Outlook/Entourage or something? Any suggestions?