http://blogs.office.com/2014/03/17/onenote-now-on-mac-free-everywhere-and-service-powered/ [blogs.office.com]

OneNote now on Mac, free everywhere, and service powered

Today we're excited to complete that story with three major developments:

1. OneNote for Mac
   
2. OneNote is now free everywhere
   
3. The OneNote service now provides a cloud API