Syncing
OneNote for web and windows 10 automatically syncs all your notes for you. If you prefer, you can choose to manually sync your windows 10 application whenever you want.

To do so: 
Click the Navigation button near the upper left of the OneNote app window.
In the navigation pane that opens, click the Notebooks dropdown arrow next to the name of the current notebook.
In the list of notebooks that appears, right-click the name of the notebook you want to sync, point to Sync, and then choose either Sync This Notebook, or Sync All Notebooks.

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