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This issue could be caused by one of the following:
1. A contact in Microsoft Outlook, Sage Software ACT!, IBM Lotus Notes, or IBM Lotus Organizer® does not contain information in one or more fields.
2. The BlackBerry device does not have enough memory to synchronize organizer data.
3. The BlackBerry device user's organizer database contains invalid information.
4. An application database on the BlackBerry device is corrupt.
5. The IBM Lotus Notes address book database has a custom template that is incompatible with the BlackBerry® Desktop Manager.
6. The BlackBerry device Address Book is corrupt.
7. The BlackBerry device is failing to synchronize to any organizer application including calendar, memo list, or tasks due to a temporary database corruption.
8. The BlackBerry device address book contains a blank contact.