Migration / New Enterprise Activation
Assuming that your user mailboxes have been moved to local Exchange and you are setting up a BlackBerry 5.0 Infrastructure, you should be able to just re-issue a new Enterprise Activation (set an EA password) for each of them, and have them Activate.
It will take a little time to move the mail locally and then do the BES EA, but it isn't too difficult.
You may also want to talk with the Hosted Service provider. Depending on the connection to the legacy BES, you may be able to use the Enterprise Transporter Tool. It is Excellent! A 100% home run for RIM that's been lacking in previous versions.
If the legacy systems allow you to use the BUA (BlackBerry User Administration tool) and you also allow it in your new environment, and have a decent network connection between the two, you should be golden.
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--KMSigma
BES 5.0 (MR2) Admin
2000 Wireless Users - Exchange 2003 SP2
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