Using New Outlook on Windows for personal email, calendar, and contact management
@Maggy Rivera said
would like to add a note or comment to an email ... where you can possibly hover over the email and see it.
I understand. Many people, myself included, would like this kind of feature. But I'm afraid Outlook can't do this.
All I can suggest is that you Vote for and Comment on these Feature Request. Maybe if enough people ask for this, Microsoft might listen.
It would be a great help to have the possibility to add notes or comments to email messages.
https://feedbackportal.microsoft.com/feedback/idea/05221cc3-b800-f011-a4de-6045bdb3947a
Need a native way to attach a private, expandable note to any email (not categories/flags/OneNote/Tasks)
https://feedbackportal.microsoft.com/feedback/idea/f627eac3-7c03-f111-bb47-7c1e52dec1a8
(You must "Sign In" at the top right of the Feedback page before you can vote).