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In a Microsoft Exchange Server 2007 environment, you encounter several problems when you administer public folder quotas. For example, several of the properties that dictate quota behavior cannot be set from the administrative cmdlets or from the Exchange Management Console (EMC). There are also instances in which selecting a specific setting cannot be undone as soon as it is applied.
To resolve this problem, install Exchange Server 2007 Service Pack 2 (SP2). You can access the following Microsoft Web site to download Exchange Server 2007 SP2: