I realize that this is an old posting, but a similar thing just happened to me.
After much panic, I eventually found the 'lost' notes in the 'Mislaced
Sections' folder.
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"chiron" wrote:

> Help!!! I have a notebook set up on a networked drive that is shared by three
> computers, each with OneNote on it. One of the sections in my notebook has
> disappeared. I don't know how or why it disappeared. It is an improtant
> section. None of the other sections are gone. I did not delete it (at least
> not knowingly, and it requires a confirm to delete), but the section is gone.
> When I opened OneNote on one of the three computers, the section was there
> for a moment and then gone as though it had been deleted when the notebook
> was updated from the network drive.
>
> When I go to the network drive and look in the file where the notebook is
> stored, there is a temp file with the name of the lost section. Can I use
> this temp file to recover the lost section? Is there any other way to recover
> a section lost from a network drive storage place? How could this possibly
> have happened? I love OneNote, but I am scared to use it if it is going to
> make my sections disappear or if it is possible for an experienced user to
> delete a section unrecoverably without knowing that he is doing it.
>
> Any help appreciated greatly.
>
> Chiron