For more information about removing specific server roles and any dependencies that might be affected, see the following:
Removing the file server role
Removing the print server role
Removing the application server role
Removing the mail server role
Removing the terminal server role
Removing the remote access/VPN server role
Removing the domain controller role
Removing the DNS server role
Removing the DHCP server role
Removing the streaming media server role
Removing the WINS server role