The RIM KB says that you have to install this on the BES server:
Quote:
Apply this hotfix on the client-side MAPI program (BlackBerry Enterprise Server running Microsoft Exchange System Manager).
Due to file dependency, Microsoft Exchange System Manager 2003 Service Pack 2 must be installed before applying the hotfix.
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You need to install the hotfix AND add the registry key.
If you don't see the registry structure, you probably haven't installed the Exch System Manager.