Versioning update to Document Libraries in team sites in SharePoint Online and OneDrive for Business

OneNote is a tricky one because it has it's own versioning and controls, ignoring SharePoint really, and the file-format is a compressed series of XML files and folders presented as .one.

Suffice to say that you never have forced check-out on libraries with OneNote files, and its best practice to leave library versioning as major only (or completely turned off) on library it is in.

OneNote (and its content format) act like a wiki with instant last character save, and multi-user editing options - it does not understand the concept of publish major/minor versioning or strong document mgmt. controls.

[saying that I love OneNote, it's a fantastic app and works really nicely - as long as you let it do its own thing and don't try to override using SP DMS controls]