Not using a public folder. You really need to create a Resource and have it
auto book.

How to Set Up a Conference Room as a "Resource" in Outlook 2000

http://www.microsoft.com/technet/prodtechnol/exchange/2000/maintain/cfsetup.mspx

and to go with the one above: How to Successfully Book a Resource

http://www.microsoft.com/technet/prodtechnol/exchange/55/maintain/cfbook.mspx

Direct booking is an Outlook-specific feature that uses the organizer's
Outlook client (Outlook 2000 or later) to book an appointment directly into
a resource mailbox schedule. The Outlook client of the person organizing the
meeting performs all the necessary tasks, such as conflict checking and
placing the reservation on the resource calendar. To set up direct booking,
follow:

291616 How to direct book a resource in Outlook 2002 or in Outlook 2003

http://support.microsoft.com/default.aspx?scid=kb;EN-US;291616

Nikki

Thanks for the response. But What I should of said but worded incorrectly was
this.

Is there a way to have a shared calendar in Public folders to automatically
decline conflicting meeting requests?