Error: Blackberry User Registration Problems / User Not Found Resulation:  Step 1  User Info Update Change User Display Name max 64 character  Step 2. Update LegacyExchangeDN atribute   Update this user LegacyExchangeDN attribute on adsiedit 3. Blackberry Contact Database Güncelleştirme Within the BlackBerry Administration Service console expand  BlackBerry Solution Topology. Expand BlackBerry Domain. Expand Component View. Select Email. Select Refresh the available user list from company directory option.