Answered my own question...the knowledge base article doesn't specificially
mention this particular dialog, but I did a test with a user and changing the
Registry key value for PONT_STRING to "32," corrected the issue.

http://support.microsoft.com/kb/831398/en-us


"Bryan - " wrote:

My question is regarding the confirmation 'pop up' message that is generated
when a resource is successfully booked. There is a checkbox that says "Please
do not show me this dialog again". If this is checked, how do you get it
back? I'm sure it's a registry key somewhere, but I cannot find any
information about it on the knowledge base. We are using Outlook 2003.

Thank you!
Bryan