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The mode parameter directs the Setup mode. The default mode is install.
Use the mode parameter to install, upgrade, uninstall, or recover server roles.
Use Setup /mode:install to install a new Exchange 2007 server or add new server roles on an already installed Exchange 2007 server.
Use Setup /mode:upgrade to upgrade and existing server that is running the release to manufacturing (RTM) version of Exchange 2007 to Exchange Server 2007 Service Pack 1 (SP1).
Use Setup /mode:uninstall (without specifying any server roles) to completely remove the Exchange server from the Active Directory® directory service and the local computer. Use the /roles parameter with Setup /mode:uninstall to remove specific server roles from an already installed Exchange 2007 server.
Use Setup /mode:RecoverServer to read Exchange configuration information from Active Directory for a server that you need to recover. The Exchange files and services are then installed on the new server on which you run Setup /mode:RecoverServer, and the roles and settings that were stored in Active Directory are then applied to that server. Do not specify what roles to restore, because Setup will detect the Exchange Server object in Active Directory (assuming Active Directory is not corrupted) and install the corresponding files and configuration automatically. After the server is recovered, the administrator can then restore databases and any additional configuration. For more information about recovering a server, see Understanding Setup / M :RecoverServer.
To recover a clustered server node, use Setup /mode:RecoverServer, and then use /RecoverCMS to restore the clustered mailbox server. For more information, see the /RecoverCMS information later in this document.
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