MAPIFolder.AddToPFFavorites is what you need.
Works in all versions of Outlook, at least starting with Outlook 2000.
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Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
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D'oh. I remember now getting tripped up by that before. Thanks. I think
you'll need Outlook 2007 to be able to do what you want programmatically.