kaestnerr posted on May 25, 2012 17:39
http://www.computerworld.com/s/article/9227490/Aged_Windows_XP_costs_5x_more_to_manage_than_Windows_7?source=CTWNLE_nlt_pm_2012-05-25
This article reviews a report by IDC and commissioned by Microsoft. It contains some good information and statistics on supporting older systems running XP. One piece missing, however, is user learning curve time. Still worth reading.