For OneNote 2003, the answer is no. ON 2003 does not support shared
notebooks.
For OneNote 2007, the answer is yes. It does support shared notebooks.

Patrick Schmid [OneNote MVP]
--------------
http://pschmid.net
***
Office 2007 Beta 2 Technical Refresh (B2TR):
http://pschmid.net/blog/2006/09/18/43
***
Customize Office 2007: http://pschmid.net/office2007/customize
OneNote 2007: http://pschmid.net/office2007/onenote
***
Subscribe to my Office 2007 blog: http://pschmid.net/blog/feed

"rseeders" <rseeders@discussions.microsoft.com> wrote in message
news:55F0E717-A683-4FD1-9583-D2E977EDD48C@microsoft.com:

> Is it possible for several people to use a single notebook in a collaborative
> effort? Will OneNote allow multiple people to access a .one file at any
> given time or will someone be "locked out" while another is using that file?
>
> My office would like to use a single notebook that would reside on a network
> drive.