--- a/unix-phil.ms	Wed Feb 24 10:42:02 2010 +0100
+++ b/unix-phil.ms	Wed Feb 24 18:05:54 2010 +0100
@@ -655,12 +655,51 @@
 
 .NH 1
 Case study: nmh
+.LP
+The last chapter introduced and explained the Unix Philosophy
+from a general point of view.
+The driving force were the guidelines and references to
+existing software were given only sparsely.
+In this and the next chapter, concrete software will be
+the driving force in the discussion.
+.PP
+This first case study is about the mail user agents \s-1MH\s0
+(``mail handler'') and its descendent \fInmh\fP (``new mail handler'').
+
 
 .NH 2
-History
+History of \s-1MH\s0
 .LP
-MH, nmh.
-They are old.
+In 1977, Stockton Gaines and Norman Shapiro of the \s-1RAND\s0 Corporation
+came up with a concept for a new electronic mail system.
+Till then, \s-1RAND\s0 had used \s-1MS\s0 (``mail system''),
+which was monolithic.
+In 1978 and 1989, Bruce Borden implemented the concept \(en
+this was the birth of \s-1MH\s0.
+.PP
+Since then, \s-1RAND\s0, the University of California at Irvine and
+at Berkeley, and several others have contributet to the software.
+However, it's core concepts remained the same.
+In the 90s, the development of \s-1MH\s0 slowed down.
+Richard Coleman started with \fInmh\fP, the new mail handler,
+in 1997 to improve \s-1MH\s0, especially in regard of modern emailing.
+Today, nmh is developed by various people on the internet.
+.[
+%T RAND and the Information Evolution: A History in Essays and Vignettes
+%A Willis H. Ware 
+%D 2008
+%I The RAND Corporation
+%P 128\(en137
+%O .CW \s-1http://www.rand.org/pubs/corporate_pubs/CP537/
+.]
+.[
+%T MH & xmh: Email for Users & Programmers
+%A Jerry Peek
+%D 1991, 1992, 1995
+%I O'Reilly & Associates, Inc.
+%P Appendix B
+%O Also available online: \f(CW\s-2http://rand-mh.sourceforge.net/book/\fP
+.]
 
 .NH 2
 Contrasts to similar sw