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Free /Busy information is not visible for a single user Exchange 2007/2010

Problem Description

None of the user is able to see Free /Busy information of a single user

Cause

User’s Default calendar permission is set to FolderVisible while this should be at least AvailabilityOnly.

Solution

Change the permission for default user with below command then free/busy information will be visible.

set-MailboxFolderPermission -Identity username@domain.com:\calendar -User Default -AccessRights AvailabilityOnly