Using New Outlook on Windows for personal email, calendar, and contact management
Hello Siobhan16,
Thank you for posting this case in Microsoft Community!
Based on your description: Unable to move emails between different inboxes in New Outlook. I would like to cooperate with you working on this case. To clarify this case, currently it still does not support to move/drag any emails directly to different Inbox folders by email account level as this feature is not available yet. As further testing from my side, it is supported to move any selected emails with right clicking Move options to different folders under same account or move to other Inbox folder such as Shared mailbox and delegated access mailbox.
I understand your query 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. Now Microsoft 365 Roadmap is Rollout Start new feature for copy email items in New Outlook which could meet your requirement soon. You may keep monitor the latest news on this:
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 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.
Hope the above workaround would be helpful. If you need further assistance, please feel free to let me know, I will keep assisting you.
Your understanding and patience will be appreciated.
Thank you!