Microsoft Office Outlook Connector for IBM Lotus Domino enables you to use Microsoft Office Outlook 2003 or Microsoft Outlook 2002 to access your e-mail messages, calendar, address book, and To Do (task) items on an IBM Lotus Domino Release 5.x or Release 6.x server. It is available from Microsoft. However, once installed, Outlook Connector will NOT connect to Notes.
The reason, it seems is a Microsoft critical update to Outlook. Which one, I don’t know. Once, reinstalling Outook 2003 to only SP2, then reinstalling Notes Connector. The Add-In worked as advertised.