OneNote Web API

OneNote and Microsoft's quiet API revolution - Scott Hanselman:

Office team launched OneNote for Mac, they also launchedhttp://dev.onenote.com along with integration partners like Feedly, JotNot, IFTTT, Weave News Reader and more all integrating with their REST API.

The moral of the story here is - if you have no API then you have no story.

the samples are all on GitHub too: https://github.com/OneNoteDev.