Using older versions of Outlook for Mac in business environments
Here is what the Ad from Microsoft looks like:
Inbox view:
Email view:
It shoes "Get the latest premium Outlook features" with a "Learn More" link, but the link is not clickable.
Here is the HTML view:
There is an empty iframe and an img that doesn't appear but it's there in the backend:
https://res.cdn.office.net/owamail/20220603005.10/resources/images/ads-olk-inhouse-readingpane.png
Also, when in the email view, you can't reply/reply-all/forward or see more actions like a regular email.