The parameter roles is not valid error message when trying to uninstall Exchange Server 2013 server role

Original KB number:   2801813

Symptoms

Assume that you try to uninstall the Exchange Server 2013 server role by running this command:

Setup.exe /Mode:Uninstall /Roles:ClientAccess /IAcceptExchangeServerLicenseTerms

However, you receive this error message:

Welcome to Microsoft Exchange Server 2013 Unattended Setup
The parameter 'roles' is not valid for current operation 'Uninstall'.
Setup checks failed: Invalid command line arguments.

Please type 'setup.exe /help' for more information.

Cause

This behavior is by design. The /Roles parameter is not valid for uninstallation operations. Therefore, you cannot uninstall individual roles from Exchange Server 2013.

Resolution

To resolve this issue, run the following command to uninstall Exchange Server 2013:

Setup /Mode:Uninstall /IAcceptExchangeServerLicenseTerms