Generally agree with this. Whoever the author is has a totally different view of "metadata". Metadata from my perspective would be "general amount of emails",

Generally agree with this. Whoever the author is has a totally different view of "metadata". Metadata from my perspective would be "general amount of emails", (possibly) "address blocks (just involved, not from/to/bcc/cc)", "time frames" (with large window averaging), (maybe...) "very vague categories".