Set Blackberry to NOT mark messages read

I have a user who has her blackberry device checking her BIS account setup to check her exchange account.  She is wanting to have it so that when she reads a message on her BlackBerry device it does NOT show up as read within her exchange account.

Anyone ever tried doing this, or are fimiliar with this?
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ok , create a blackberry service email account or use the blackberry email account as a contact on exchange . the create contact object on ad for that email.
then create a forward to forward emails to both blackberry and exchange email account.

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If you turn wireless reconciliation off, then it won't mark it read. However it won't synchronise deleted items as well.
go to messages (or your email folder)
email reconciliation
change the wireless reconcile to OFF

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