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Based on the description, it sounds like the PDAs are downloading email messages using POP3. If that is the case, check the POP3 settings on the handheld devices to see if there is a setting that will leave a copy of the message on the Exchange server.
It's also possible that your Active Directory (AD) user accounts are configured to forward a copy of all email messages to the PDA. If that is the case, then check the respective AD accounts; there is a checkbox under Exchange General -> Delivery Options that lets you keep a copy of all messages in the Exchange Server mailbox.
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