I have synchronized OneNote with my device using Windows Live SkyDrive. To do so is simple but lengthy, and I could easily inadvertently mislead you by trying to explain it. Very good instructions are on the official Windows Phone help site. (If I had NoDo, I could copy and paste a link. Sorry). Sooner or later there will be a direct mobile link to SkyDrive and SharePoint, but for now access can be gained through IE. (OneNote still syncs of automatically though). I hope that is useful info.
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