Outlook 2003/Windows XP.

Opening a shared mailbox, user cannot see contents of the folder (emails),
yet in the bottom right its shows the amount of emails actually in the folder
within the mailbox. Have opened the same mailbox on a different machine and
can sucessfully view the emails within the folder. Have tried to re-open the
mailbox on the users laptop as well - still same fault.  

This is an addional mailbox that user opens that is shared between users -
his own mailbox is default and is in cached mode, whereas additional mailbox
is viewed in online mode.

No filters applied to the folders either. Permissions set to none for all
folders. Very weird fault. Any suggestions?