I migrated several users using Outlook 2007 and pst files to Exchange Server 2007. Exported 1 week of data to the server and left the rest as pst in their local HD's for historical purposes. The contacts did not carry over to the server so I simply copied them to the Exchange mailbox. After I do this I end up with 3 "Contacts" folders: exchange server, local one under personal folders, and an empty one. I want to keep only the one on Exchange but I cannot delete the other ones. How do I delete the others?