I need to move a public calendar from one public folder to another on the same Exchange 2003 Server in the same Public Folder Store. I've some some internet searching but I have not found a way to make this happen. Any help would be much appreciated.

Clarify: You want to move a shared public calendar under one public folder to another, right? You need to Cut/Paste folder from ESM, not from client I tested from my virtual machine, its working [Windows server 2003 + Exchange server 2003 + Outlook 2003]