When OneNote shows "Not Responding", it usually means the app is stuck during a task (syncing, loading a large notebook, ...

If you see the OneNote error 0xe0000002, The exception unknown software exception error. Use these fixes to resolve this error. This error can be fixed by updating ...

Use the following suggestions if the OneNote notebook is not showing in the app. Sometimes, it can be the corrupt cache in OneNote that causes issues. Clear OneNote cache and see if it works. OneNote ...