I have been a faithful fan of Microsoft OneNote; the rich functionality, collaboration features, and tight integration with MS Office play especially well with SharePoint and Office 365. Most importantly, the Windows Key + S screen capture shortcut is a godsend.
I liked OneNote so much that I shared some tips at the Southeast Asia SharePoint Conference few years ago (Slideshare).
All this changed when I switched the Kattelo hardware platform to Mac. Office Mac 2011 does not include OneNote. Alternatives are OneNote Web App and virtualized Windows environments. While the OneNote Web App offers the basics, it does not quite compare to the full fidelity of a desktop app, like Evernote.
Regarding virtualization, the most popular options are VMware Fusion, Parallels, and Virtual Box (free). Our Kattelo teams ended up deploying VMware Fusion for the unity feature, which allows Windows applications to seemingly run natively on Mac.
All these changed on March 17, 2014, when Microsoft released OneNote on Mac App Store, Hoping to synchronize all notes saved in Office 365 across the various devices, I was rapidly disappointed. The current version does not support Office 365!
Only OneDrive (formerly known as SkyDrive) is supported as of this writing. As much as I find Evernote limiting, I simply cannot recommend OneNote to organizations with cross-platform, cross-device requirements until Microsoft ups the interoperability ante, hopefully in very future.