Folders from within the Shared Information folder have appeared at the outer level in the folders list.
Folders that should be contained within the Shared Information folder (folders shared by other users and public folders) may appear at the top level in Outlook alongside the default Outlook folders. Copies of these folders may also appear elsewhere within the Shared Information folder.
Synchronisation may not be happening correctly.
A user has dragged the folder out of the Shared Information folder
There was already a shared information folder in the PST file when the WorkgroupShare Client was installed
There is an Add-in conflict
The PST file may by corrupt
If you have entered data into a folder that has not been synchronized to the server (nor to other clients) then make a backup copy of these folders.
Uninstall the WorkgroupShare Client from the machine
Delete any folders that do not belong to the local user, including the Shared Information Folder