Evernote builds on the new Office add-in model, using the programmable task pane to annotate and save Outlook messages to Evernote or attach Evernote notes to Outlook email messages; see the Evernote for Outlook Quick Start Guide for more details. Also note that the Office add-in model is now one-to-many (add-in:app); e.g., adding the new Evernote add-in to the browser Outlook Online app also adds it to the Outlook 2016 (Windows and Mac) apps.
"Save important email conversations from becoming lost in a cluttered inbox and keep them together with related project notes and notebooks. With the Evernote for Outlook add-in, you can save an email (including its attachments) or entire threads directly into a notebook of your choice. You can also add tags and remarks on the spot. Once you’ve clicked Save, a clean version of your email will appear as an editable note in your Evernote account."Introducing Evernote for Outlook - Evernote Blog