Using New Outlook on Windows for personal email, calendar, and contact management
Hello Muhammed Saadman Talukder,
Thank you for posting this case in Microsoft Community!
Based on your description: Find and replace text within an email message or item in New Outlook. I would like to cooperate with you working on this case. To clarify this case, as further research and investigation from my side, Find and replace text feature is still not available in New Outlook yet. For more information, you may check this article as reference Feature comparison between new Outlook and classic Outlook which help to learn more about the available feature in New Outlook. In this case, we do apologize for the inconvenience this may cause and really appreciate you for bringing this into our sight.
I understand your concerns here but please note Microsoft is constantly working on improving this product and adding more new features and the new Outlook for windows (Preview) version is still under active development. Therefore, I suggest keeping an eye on the Microsoft Outlook blog or the Microsoft 365 Roadmap | Microsoft 365 for any updates on this feature. In the meantime, I do apologize for the inconvenience this may cause, if you heavily rely on this feature, you may consider Toggling out of the new Outlook for Windows preview - Microsoft Support for now. I will also update here once I get additional information and the specific timeline for the feature will be added.
At this point, it is also recommended that click Help > Feedback > Report a problem or Contact support and provide feedback within the new Outlook for Windows and add your concern as an idea through the new Outlook in-app support Feedback site. Microsoft will keep monitoring customers feedback and valuable ideas there to consider/include in the future product update.
Please note that nobody here is the product developer/decision maker and has no control over the product. Everyone, including us as a community moderator, can only assist you with the query for providing available solutions and the feature's availability status within our scope and capability.
To check more details about how to submit feedback, kindly refer to this article Learn about how to provide feedback to Microsoft - Microsoft 365 admin | Microsoft Learn
Thank you for your time and understanding. For other questions, feel free to add your post to the Microsoft Community.
Your understanding and patience will be appreciated.
Thank you!