At the moment many users do not select the meeting room or conference room
(identified as a resource) in the Resources column when creating
appointments. They usually enter this in either the Required or Optional
columns. At the moment we have  a workaround where an auto reply (server
rule) is created to inform user that they have book wrongly and to resubmit
the booking and also follow the URL where our intranet details a how-to
guide. But is there a way to force resources?

When booking resources for a full day the status changes to Free from Busy.
How can someone be Free when they have an appointment for the whole day? Can
this always be kept as Busy? Best if can be configured and locked at the
server end.

The above are for corporate solutions using MS Exchange 2003 SP2.