Advanced Find - Public Folder - Search Sub Folders

I am using Outlook 2003 sp1 on an Exchange Server. When I use Advanced Find
in my personal folder I can select to search sub folders, and select multiple
folders at one time. But, when I try to search in a public folder I can only
search one folder at a time, it will not allow me to select the search sub
folder optiono or to select more then one folder at a time. This includes
floders and subfolders that I created in the public folder. Is there
something that can be done to the public folder to allow searching multiple
and/or sub folders?
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Thank you for any and all help.
M Drescher
Rensselaer County Public Safety, NY