Spitoon - initial empty and vanish was everything in the Inbox, oldest item probably 12 months old, newest, that day. Everything in place at shutdown, then at next powerup/Outlook open - everything in Inbox gone.
Milo - No access from other machines. No limit on Inbox size that I would remotely ever reach. Old and new vanished from Inbox. Only Inbox - all other folders remain intact.
Cheers - SF