
There is no way to send anything from Outlook to OneNote, unlike the Windows version.

There is no way to export notes to Word, and even copy/pasting text results in formatting hell. OneNote is curiously disconnected from the rest of Office.

Determining where to put something and where to find something is time consuming and irritating, especially if you find yourself using multiple notebooks. One can, of course, restrict use to a single notebook with a lot of tabs each with a lot of notes, but that is not what the product encourages. Unlike Evernote, Apple Notes or a folder full of text docs, OneNote lets you get lost. Every time you create a group, project or Sharepoint site, separate OneNote notebooks come along for the ride.

Office 365 makes it clear that Microsoft wants you to create lots of OneNote notebooks.
