One reason your OneNote Notebook is unable to sync is that your Internet connection is poor. To confirm this, we need to check the bandwidth. You can do this by using one of the free Internet speed ...

Fix OneNote can't connect to the server, Sync will resume once we connect. You don't need to take any action. (0x803D0014 ...

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

With my announcement about leaving Evernote for the wonderful world of inking in OneNote, several folks have asked about how syncing is done in OneNote, the issues with using folder type syncing, etc.