OneNote Gem Add-Ins

Question:
How to change "My Office" launch OneNote instead of OneNote 2016?

Answer:
In general, "My Office" launch OneNote for Windows 10  (OneNote UWP)  in default.
But, you can change to launch OneNote 2016.
Change onenote: protocol to make "My Office" launch OneNote 2016.

Steps:

 1) Open Windows 10 Settings -> Apps -> Default apps -> Choose default apps by protocol.

2) In "Choose default apps by protocol"

Find the URL:OneNote Protocol, in "[+] Choose a default", select "OneNote 2016" from "Choose an app" list.

After changed the URL:OneNote protocol to OneNote 2016.
Click "My Office" -> Programs -> OneNote -> Open, it will launch OneNote 2016.