See http://support.microsoft.com/kb/823662

>I am using VFP9 SP2 with all hotfixes and Outlook 2010.
>OLE IDispatch exception code 4096 from Microsoft Outlook: Outlook does not recognize one or more names.
>
>I am getting this message on one machine on the network, others work fine. It happens at least once each time I send multiple emails, but on different emails each time.
>
>It happens on the .Send() line in the code (attached). I click 'Ignore' and the code completes and that email will eventually end up in 'Drafts' instead of 'Sent'.