The issue focused on knowledge base updates that require configuration changes and thus require frequent restarting of the Microsoft Exchange Server 2007 SP3 Service Pack 1 or Exchange Server 2007 SP2 Service Pack 2 operating systems. For example, when using Exchange Server 2007 SP3 Service Pack 1 (SP1), each configuration change requires restarting the Exchange Server 2007 SP3 Service Pack 1 operating system. When using Exchange Server 2007 SP2 Service Pack 2 (SP2), each configuration change requires restarting the Exchange Server 2007 SP2 Service Pack