M is the latest name for the MUMPS language - which was revised as recently as 2005 by ISO. All the major VistA derivative solutions (WorldVistA, vxVistA, and Medsphere’s OpenVistA) are MUMPS (henceforth M) based solutions are derived from the FOIA release of VA/VHA VistA. M is at the core of many of the largest healthcare and financial systems that everyone in the world interacts with on a daily basis. It is a language derived from years of healthcare and finance experience - and years of development after 1969 both inside and outside of Mass. General.