Correction, I failed to include an important web site to my list. For case studies check out comparing UNIX to MPE/iX: http://aics-research.com www.adager.com http://www.aberdeen.com - did a study of the HP 3000 and user base http://www.hp.com/csy Ask Ron Seybold of the HP NewsWire Search back issues of INTEREX publications - www.interex.org