It is not recommended to have more than 15users on a BES which is residing on the Exchange.
This applies to BPS as well because imagine the impact on the Exchange and BES when the workload of emails are high for the Exchange.
The BlackBerry Enterprise Server will suffer the impact as well.
I will suggest check you permissions on your Exchange as well, if it is propergated down to the Exchange mailbox store. There are incidents that the permissions were not propergated.
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MCSE, MCITP Enterprise Messaging Administrator, MCITP Enterprise Administrator
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