Hi @MBoudreaux ,
Is inline comments available for Outlook version 1.2023.616.100?
No, I am afraid it's not yet available.
I've just tried making a suggestion via Help > Feedback. And it's recommended to submit the feedback from your end as well:
Given this, you can consider manually inserting your name and adjusting the format of the reply to imitate the effect of the Inline comment. (To be able to reply within the original email, you can click the "Show message history" button:)
Or you can switch back to the classic Outlook by toggling off the New Outlook at the upper right corner:
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