A message that is transmitted as a result of an LUW completing a syncpoint (at which time changes to data resources made by the LUW are also committed). A committed output message is one that, in the event of a failure, needs to be transmitted and acknowledged to be sure that logical consistency with the changes to data resources is maintained. During recovery processing, if an LUW has committed its changes but an associated committed output message has not been transmitted or has not been acknowledged, CICS places the message in a message cache. The system can retransmit the message from the cache if desired.