This is expected behavior when the resource is set up for direct booking. If you don't want the resource to be directly booked, you need to turn off all the related settings in Tools | Options | Calendar Options | Resource Scheduling and reduce permissions on the calendar folder so that only the person(s) authorized to accept meeting requests can create items there.

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> When I create a new appointment in my outlook calendar and invite the
> intended resource through the resource button, the mailbox setup as the
[quoted text clipped - 6 lines]
> Please advise on how to receive the email and make sure the roon
> booking shows as tentative until booked.