I was using StartOneNoteImporter to transfer my notebooks to OneNote. I was able to import all the notebooks I needed, but one of them was empty and I realized I didn't like a setting that I chose. So I deleted the contents of my OneNote and ported them again. Except the notebook I need is gone. I think one of the notebooks are in a different name from month ago. I can't find anything in my trash. I primarily use EN through Chrome, but I have it on my Windows 10 as well.