Had a forced Office update (dogfood I guess) to 2016 yesterday. When I tried to open OneNote after all the Office apps shut down for the update it kept demanding email login info, even though my Skype and Outlook came back--not quite the same but at least all the contact info seems to be there--without requiring a login. It said my standard Microsoft work address wouldn't work 'cause it belongs to a company. I tried a couple other email addresses and passwords but no joy. I didn't know OneNote was independently secured. If I did know it was probably years ago. If I have the right email address it's in OneNote (stupid irony).
I tried pulling the backups (click File, and then click Open Backups), but there's nothing there, just a couple of Quick Notes default pages, which are empty. Does that mean everything's gone?
As part of trying to recover the notebook, I somehow I moved my notebook (with the dozen or so pages) to the Misplaced Sections. It also shows just a bunch of default pages that are empty. It says it can't sync some changes in the section 'cause the file was moved or deleted. When I check the History, all I get, even for six months of recent edits, is a couple of untitled, blank pages.
Is there anything else to try, any other places to pull backups from? I don't know why all the backups disappeared with the access. Why does OneNote require access that even Outlook doesn't? Have there been problems with updating OneNote in upgrade to Office 2016?