Checking who has additional mailboxes added to outlook

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http://serverfault.com – In outlook when you add an additional mailbox is there a way for you to see if someone else has added your mailbox to their outlook to view your emails? I have a feeling someone has my mailbox added to their outlook as my emails will sometimes go read than quickly unread. Or is the only way to ask the exchange administrator to verify that? Thanks (HowTos)