Evernote for Outlook Add-In doesn't appear to exist for Outlook 2016 or older versions. In the Microsoft Store, they only offer an Evernote Add-in for their Browser, Edge. In Outlook Help, they "say" that you can use an Add-in in Outlook 2010 and 2016 - but they appear to be talking about the Evernote Clipper that was included in the older versions of Evernote - because the instructions tell you to authorize the clipper listed in the Add-in List. There is no Add-in list that offers a Evernote clipper in the Outlook 2016. After the release of the new Evernote, you are only offered the option to add Evernote for Outlook with the Outlook 365 and later versions.
In short, the new Evernote version removes the ability to copy Outlook notes and emails into your Evernote Notebooks - unless you are using the newest version of Outlook.
Please go back to the old version Clipper for Outlook!!!!