I have the latest freebie Microsoft OneNote for Mac, running on a Macbook Air with Mavericks 10.9.4. Try as I might, I can't find out how to get it to open more than one window. I'd like to be able to view 2 pages from the same section in a Notebook, or 2 pages from different Notebooks, but I can't work out how to do it.
Sorry if this is a repeat - I thought I'd posted it a few weeks ago but I can't find it in my "asked questions" list.
This feature hasn't been ported to the Mac version of OneNote. It is a highly requested user feature on their feedback forum: https://onenote.uservoice.com/forums/256328-onenote-users/suggestions/6158369-allow-multiple-windows-on-mac