Do you know how to use offline booking of resources in Outlook?
Microsoft Office Outlook 2007, Microsoft Office Outlook 2003, Microsoft Outlook 2002, and Microsoft Outlook 2000 allow you to schedule a resource, such as a conference room or piece of equipment, without the Microsoft Exchange Server account that is assigned to this resource being online to accept the booking. I found this article which outlines the procedures that are associated with this feature.
Note: The procedures in this article only apply if you have installed Outlook with the Corporate or Workgroup option. With this option, you can use Messaging Application Programming Interface (MAPI) services. To determine your installation type, click About Microsoft Outlook, on the Help menu. If you have the Corporate or Workgroup installation, you see "Corporate or Workgroup"