In order to take advantage of the single Mainframe Access XML configuration file you must have taken all the actions specified in Migration to use the XML configuration file topic, and be using the unified scheduler and using MFA Server to start the holder task internally. This is equivalent to having set ZSERVER FEATURE=HOLDER in the MFA Server configuration file in Enterprise Developer 3.0 and earlier. These migration actions can be found in the Micro Focus Enterprise Developer 3.0 product Help.