John Guin of the OneNote Team has created an Add-In for Outlook to automatically Send To OneNote. His description:
This addin adds the capability of sending yourself email with a certain keyword in the subject and having Outlook automatically create a new page in OneNote’s Unfiled Notes section when that mail item arrives. Outlook then deletes the email. It also allows power users to set the filter used for incoming mail items to trigger the code. It provides no UI for the user: “it just works.”
NOTE: The source.zip download does not contain a setup.exe file. Visual Studio is needed to compile it.
Found (and copied description) via Dan Escapa’s post.

I need the ability to send existing Outlook Tasks to an Unfiled OneNote 2007. Does this already exist or is it a possibility. I am completely organized in Outlook using tasks and categories but want to move to OneNote.
I have Oulook 2003 and Onenote 2007 over Windows Vista. I am looking for the same thing. is there a way to do this yet, short of copying and pasting all of them?
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