In a Microsoft Exchange Server 2007 environment, you configure a room mailbox to have the AllBookInPolicy attribute set to "false." When you do this, the legacy free/busy information no longer appears for the appointments that are booked against the mailbox.

For example, when you examine the free/busy information by using the Scheduling Assistant, the room mailbox shows a status of No Information.

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This issue occurs because the default permission is changed to "None" when the AllBookInPolicy attribute is set to "false." This situation prevents the Exchange System Attendant from publishing the legacy free/busy information.

By default, when any mailbox is created, the free/busy permissions are set as follows:This condition is also true for resource mailboxes.

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To resolve this problem in Exchange Server 2007 Service Pack 1, install Update Rollup 1 for Exchange Server 2007 Service Pack 1. For more information, click the following article number to view the article in the Microsoft Knowledge Base: To resolve this problem in the release version of Exchange Server 2007, install Update Rollup 6 for Exchange Server 2007.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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To disable the AllBookInPolicy attribute, run the following command in the Exchange Management Shell: For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

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