Situation:
When you try to book a resource like a conference room, for example, by using a resource mailbox that has been configured to automatically accept meeting requests, the meeting request is not automatically accepted. Additionally, you cannot book the resource, and you do not receive the following confirmation message:

The resources for the meeting were successfully booked.

Cause:
This problem occurs because you are trying to book the resource using Microsoft Outlook Web Access. Outlook Web Access does not currently support the "direct booking" of meeting requests.

Workaround:
To work around this problem, use Microsoft Outlook 2002 or Microsoft Outlook 2000 to directly book meeting requests. Also, to facilitate the automatic processing of meeting requests by a resource mailbox, you can install and configure the Auto Accept Agent. This is an event sink that monitors the Inbox of a resource account mailbox and intelligently responds to meeting requests. For more information about the Auto Accept Agent, view the following Microsoft Knowledge Base article:

Status:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Related Link:
The Auto Accept Agent Deployment and Administration Guide is now available