I know it sounds familiar, and of course there can be several reasons and appropriate solutions to these, but I tried nearly all (I know) of them. A user of my company uses a mailbox, stored by an Exchange 2003 Server. We recognized, that every more than 30 days old mail disappear. We checked the auto-archiving option in Outlook 2007, the views and rules set by the user, but found nothing unnormal. Next we deleted the mailbox (after we made a backup of its content), and created a new one. But this didn't solve the problem. Has anyone an idea to this problem?