Article:
  David Pogue on Missing Manuals as Performance Art
Subject:   What's a 'letter' in Sherlock
Date:   2003-01-18 13:37:57
From:   anonymous2
I can't believe no one at Apple knew this -- it's what Apple's AOCE called email messages, the file type being 'lttr'. AOCE was around in 93/94, the only thing from it that still exists is the keychain.