You might want to look at a 3rd party add-in called WS:Repeat Appointment
that allows you to choose a more customized pattern for recurring
appointments. Details here:
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Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Coauthor, OneNote 2003 for Windows (Visual QuickStart Guide)
Author, Google and Other Search Engines (Visual QuickStart Guide)