OneNote is used to capture notes throughout the whole organization. Many employees open multiple notebooks in OneNote so that they can share information between departments and so that they can segregate information appropriately. We use OneNote as a tool for capturing meeting notes, project information, account information, and just about anything a user wants to keep track of. With OneNote syncing across all of a user's devices, it opens up the ability for employees to look up information wherever they are and whenever they need it.
Now that we have deployed Office 365, the use of OneNote has increased as has the overall productivity of our employees. Not only are notes now on the cloud and no longer on individual computers, but it is much easier to share notes, restore them, and keep them up to date. I always have multiple notebooks open so that I can separate any personal notes from my business notes. I often find myself looking up information on my phone that I entered on my computer. This is extremely helpful in meetings and when I'm out of the office or on my own personal time.