Using New Outlook on Windows for professional communication and productivity
Hi Jenny,
Welcome to the Microsoft Q&A forum.Based on the information I have found, at this time, New Outlook does not provide the option to translate a message before sending, as Outlook Classic does.
In this case, I recommend that you share your feedback about this issue with the Outlook development team through Microsoft's official Feedback portal.
Submitting your feedback will help the development team better understand users' needs and expectations. They may consider adding this feature to New Outlook in the future.
If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.
I look forward to continuing the conversation.
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