OneNote open a folder as notebook

There is a feature named "Open a folder as notebook" in OneNote 2007.

But after OneNote 2010, this feature has removed.

Gem for OneNote bring back it now.

Sample:

We want to Open the "C:ONNotebook" windows folder as an OneNote notebook.
 

1. In OneNote, Click "Gem" tab -> "Open Notebooks" menu -> "Open Folder as Notebook" command
2. In the folder dialog, select the "C:ONNotebook", and click "OK".

OneNote will open the "C:ONNotebook" as a notebook, its subfolders as OneNote section groups.