You can use the Desktop Manager to backup the BlackBerry. If you don't perform a wipe and add the users to the BES nothing happens to the data on the BlackBerry. BES services will just be added.
To be clear email/sms/call logs are not store on the BlackBerry forever. This data type will get deleted over time because the device memory is limited.
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Exchange 2007/BES 5.0.2 MR2
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