Invalid CMS Target Path Format

[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]  

Topic Last Modified: 2007-03-27

Microsoft Exchange Server 2007 setup cannot continue because the attempt to install the clustered Mailbox server role to a shared cluster drive failed.

The /CMSDataPath: <PathToTheDatabase> parameter submitted was in an invalid Universal Naming Convention (UNC) format. Exchange setup requires that the /CMSDataPath: <PathToTheDatabase> parameter specified use a valid drive letter assignment, for example, /CMSDataPath: s:\<PathToTheDatabase>, and not the UNC format.

To resolve this issue, use a valid drive letter assignment for the /CMSDataPath: <PathToTheDatabase> parameter.

For more information about installing the clustered Mailbox server, see "How to Install the Mailbox Server Role on the Active Node" ( in the Exchange Server 2007 product documentation.