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

In this post, we will see how to fix OneNote sync error 0xE4020045 (Unsupported Client). Because this is a OneNote sync error, you will not be able to sync your ...

If OneNote sections or pages have disappeared or you cannot find the same data on the web or desktop version, here is how to fix the problem. This issue mainly occurs due to a OneNote synchronization ...