The document provides guidance on how to work with OneNote notebooks when some collaborators are using older versions of OneNote. It explains that notebooks created in OneNote 2007 can be opened in OneNote 2013 in compatibility mode, but certain features will be unavailable. For shared use, the notebook can be converted to the 2010-2013 format. Notebooks from OneNote 2010 open without issues in OneNote 2013. Converting a notebook to the OneNote 2007 format disables newer features to allow sharing, but content using those features may be affected.