Did you (or your admin) get an announcement like this in your Office365 tenant? If so be sure to click the DISLIKE to let them know you object to the removal of a key piece of reliable software from Microsoft Office365:
Office 365 from the Office Portal will not include OneNote 2016 for Semi-Annual Channel Users on Windows 10 by default
MC173380
Stay Informed
Published On : February 12, 2019
In September 2018, Microsoft announced that OneNote for Windows 10 would be the default OneNote experience, and additional information was provided in a
blog in April 2018. As we complete our rollout, we are now moving into the final Semi-Annual Channel. If you are not using the Semi-Annual Channel, you can ignore this Message Center post. Starting on Tuesday Feb 12, 2019, OneNote 2016 will not be included by default when a user on the Semi-Annual Channel downloads and installs Office 365 on Windows 10 from the Office Portal.
How does this impact me?
This change does not affect managed deployments of Office where admins still have full control on whether to include or exclude OneNote 2016. OneNote for Windows 10 is available in the Microsoft Store. If the Store is disabled, we recommend enabling the Microsoft Store for Business, which allows whitelisting approved applications.
What should I do to prepare for this change?
If your users still require OneNote 2016, they can still install it. Please see the Additional Information for a help article on installing OneNote 2016 for self-service users.
Microsoft