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Evan Dodds posted a great series on Exchange special mailboxes on his blog. There were 3 parts in that series:

Exchange Special Mailboxes Part 1 - System Mailbox

Exchange Special Mailboxes Part 2 - System Attendant mailbox

Exchange Special Mailboxes Part 3 - SMTP mailbox

Evan updated those posts few times with additional information to cover some of questions that he was getting in post feedback, so those are quite complete at this point.

A great read if you ever wondered what those were about!