What: Microsoft is no longer developing new features for OneNote 2016 for Windows, and has begun automatically uninstalling the application as part of normal Office updates.
Its successor, OneNote for Windows 10, is available through the Microsoft Store. The new OneNote for Windows 10 app is Microsoft’s recommended version of OneNote.
If you’re not quite ready to make the switch, you can keep using OneNote 2016 by manually reinstalling it.
OneNote 2016 for Mac is unchanged and will continue to receive updates.