Using New Outlook on Windows for professional communication and productivity
Dear @Xwct
You can save an email to a local folder without switching back to classic Outlook. In new Outlook, right-click the message in the message list, select Save as, choose your File Explorer folder, and click Save. This creates an .eml copy and leaves the original message in your mailbox.
I’d test Save as with one email in the same folder where drag-and-drop failed. If the file appears, you have a workaround and have narrowed the issue to drag-and-drop. If Save as also fails, try a different local folder you can write to and check Downloads for the file Outlook reported as downloaded. Please refer to this: Save an Outlook message as a .eml file, a PDF file, or as a draft
If Save as works but dragging still reports success without creating a file, I’d report that through Help > Feedback in new Outlook. Include whether it happens with one message or only when dragging several, and whether the file appears in Downloads instead of the target folder.