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Uninstalling Business Contact Manager for Outlook 2003 caused the warning message to stop appearing. To uninstall the program do the following:
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Click Start menu > Settings > Control Panel, double-click Add or Remove Programs.
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Click Business Contact Manager for Outlook 2003 in the currently installed programs and updates list.
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Click Remove, and then follow the instructions on your screen.
Microsoft Article on “Remove Business Contact Manager for Outlook 2007”