I use MS Win 10, with a MS Office 365 Subscription, and use EN-for-Windows (6.18.4.8489 (308489) Public (CE Build ce-62.3.7750)), 95% o the time.
My desktop installed MS Outlook App, is the bucket where I collect all emails from my 5 different web-mail accounts, gmail, outlook, yahoo etc. My MS Outlook app, only shows 1x EN add-in has been installed, yet 2x EN-Add-ins display on the Outlook menu/ribbon, when specifically using my Microsoft email e.g. name@outlook.com versus when using any other email account, whereby only 1x EN-Add-in menu icon is displayed. So my 1st question is