You can move or copy Outlook calendar entries into a new calendar by exporting the calendar as a PST file and then importing it into a different Outlook account or calendar folder. You can also copy events directly by selecting them and dragging them into the new calendar. You can try the best tool like Softaken PST Duplicate Remover. It can quickly detect repeated calendar entries while matching criteria such as subject, date, time, and remove them without losing important data. The tool has a simple interface for all non-technical users, and they can use it without any technical skills. It will work on all Windows OS versions like 11, 10, 8.1, 8, and 7 without downloadingany other application. After removing duplicate items, you can copy the Outlook calendar and paste a new calendar without facing any issues.