Only the Mailbox role can be installed on a cluster server
[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]
Topic Last Modified: 2006-06-07
Microsoft® Exchange Server 2007 setup cannot continue because its attempt to install a role other than the Mailbox Server role on this clustered server failed.
Microsoft Exchange does not 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 (http://go.microsoft.com/fwlink/?LinkId=68190).