1. A mass-scale, user-independent, device-independent, voice messaging system that converts an unstructured voice message into text for display on a screen; the system comprising (i) computer implemented sub-systems and also (ii) a network connection to human operators providing transcription and quality control; the system being adapted to optimise the effectiveness of the human operators by further comprising: a computer implemented context sub-system adapted to use information about the context of a message or a part of a message to improve the conversion accuracy.