The Exchange server went down whilst a user's Outlook was populating its local copy for the first time. Once the server came back up and the client re-established its Exchange connection, the Sent Items folder now appears within Deleted Items. It cannot be moved back to its original location at the root of the mailbox along side Inbox etc, giving the error below.
Is it possible to move the folder, or set a new Sent Items folder and copy the emails to it?
"Cannot move the items. Special folders, including the Inbox, Contacts, Calendar, Notes, Tasks and Journal folders, cannot be moved."