Best tool for Creating Bulk Exchange mailboxes for Exchange 2013
You can download the Exchange 2013 Bulk User Creation Tool from the following link. You will need to have version 4.5 of the .NET framework installed as well as the Exchange 2013 management tools.
The Exchange Roles parameter isn’t supported when using the Uninstall Setup mode. When you uninstall Exchange 2013, all server roles are uninstalled from the computer. Uninstalling individual roles isn’t supported.
You cannot uninstall individual roles from Exchange 2013
Cumulative update 1 for Exchange Server 2013 has been release with new functions here is the download link