Clustered Mailbox Server installation cannot continue: Object reference not set to an instance of an object Clustered Mailbox Server Prerequisites Failed Error: Clustered Mailbox Server installation cannot continue: Object reference not set to an instance of an object. Elapsed Time: 00:00:20

Please explain how does you install clustered mailbox server. Do you install others roles as well? Please refer to below link: http://www.msexchange.org/tutorials/Installing-Configuring-Testing-Exchange-2007-Cluster-Continuous-Replication-Based-Mailbox-Server-Part1.html

Hi Shady, Any updates? How did you install the SP1? You can follow this document to install it. Upgrading Clustered Mailbox Servers to Exchange 2007 SP1 or SP2 http://technet.microsoft.com/en-us/library/bb676559(EXCHG.80).aspx By the way, why not install Exchange 2007 SP2 directly, even Exchange 2007 SP3?Frank Wang

Hi Shady, How about your question? Any updates?Frank Wang