Solution:- 1. Delete the following folders on your Mac. /Library/Containers/com.microsoft.onenote.mac /Library/Group/Containers/UBF8T346G9.Office 2. On your Mac OS X, open “ Keychain Access” app and search for “MicrosoftOffice”.
If OneNote app recognized that you signed in, you’ll have entry with long name. Restart your Mac computer. Then try to launch OneNote app and signing in again. SEE ALSO: If you find any other solution to fix “OneNote for Mac crashes on start”, inform us via comment.
Perhaps most interestingly, OneNote for Mac includes the true Office “Ribbon” interface for the first time in OS X. Introduced by Microsoft in Office 2010 for Windows, the Ribbon interface is a popular way for users to access common functions inside Office OneNote for Mac requires OS X 10.9 Mavericks.