I think you may find it useful as well. I wrote this script to monitor a particular mailbox for unread emails count in a particular folder and notify people about it. It could be useful to monitor a service mailbox and make sure it does not have any email
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First thing first, you cannot use Exchange Web Services (as of now) to update the IsRead flag for items other than MessageType. MessageType has IsRead property in place to update the MAPI property PR_MESSAGE_FLAGS. Product group is aware of this limitation
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