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.