Question : How to open OneNote 2007 notebook in OneNote 2010

I can't figure out how to open a OneNote 2007 notebook in OneNote 2010.  What I am experiencing is that the interface appears to have changed.  OneNote was unique in that the application could open a folder as a notebook.  When I try the same thing in OneNote 2010, it appears to only accept looking for a file.  Since there's no file at the top level of the notebook, the only thing I appear to be able to do is open individual sections.  Since there are many sections in this notebook, that really doesn't seem feasible.

This is on the recently released beta for IT pros and developers.

Do I have a bad installation or have they changed the interface?

Answer : How to open OneNote 2007 notebook in OneNote 2010

something's probably wrong with your installation.
It works fine here.
Here's how I manage my one note files.

I have one note files located on another partition (if I need to reinstall, I don't have to worry about moving those).
Once I've reinstalled (Windows, Office version, doesn't matter), I just have to open windows explorer and navigate to my one note folder, then click on any file and choose to open Workbook.
This way One note will use the folder on another partition instead of C:\
Thats's it, this should also work for you.