Only the Mailbox role can be installed on a cluster server_ClusSvcInstalledRoleBlock

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Applies to: Exchange Server 2013

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Microsoft® Exchange Server 2007 setup can't continue because its attempt to install a role other than the Mailbox Server role on this clustered server failed.

Microsoft Exchange doesn't support Exchange 2007 roles other than the Mailbox Server role on servers that have the Cluster service installed.

To address this issue, see "High Availability for Exchange 2007" in the Exchange Server 2007 Operations Guide.