wrote:

Outlook 2003
Microsoft Exchange Server

I have permission to view another user's mailbox. When I add it, I
can see the Inbox and a small selection of the subfolders of that
Inbox. However, I know that there are many more folders than I can
see.

Has the owner of the shared mailbox granted to permission to see those other
folders? Every folder must have the proper permissions. There's no
inheritance of permission for folders, as far as I know.
--
Brian Tillman [MVP-Outlook]