MASS-11 was a word-processing package for VAX systems running VMS. I have a CHARON-VAX customer that has lots of files in MASS-11, and so I researched how to convert them to something more modern (Microsoft Word?).
Microsystems, the people who developed MASS-11, still exist. They only do conversions now, but here’s their information in case someone’s interested in going that way…
377 East Butterfield Road
Lombard, IL 60148
Their web site (www.microsystems.com) is sometimes slow to load, but the phone number works.
[Adapted from a comp.os.vms posting of March 2006]