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For anyone still interested, Outline seems to have added support for editing OneNote notebooks and syncing via skydive.

http://outline.ws/mac

Unfortunately, they don't seem to have a trial version which is a bit annoying.
 
As versatile as Growly Notes is, and as much fun as I had porting old documents and journals to it, I finally made the switch to Evernote. Having everything backed up to the cloud and available to my iPhone is just too handy to do without.
 
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