IBM's decision to offer a Linux-only mainframe--at 90% less than the cost of its flagship box has had the intended effect, research now shows. "<A HREF="http://searchenterpriselinux.techtarget.com/originalContent/0,289142,sid39_gci1271789,00.html?track=sy184&asrc=RSS_RSS-15_184">Linux is a key to the IBM mainframe new-workload strategy,</A>" said Charlie Burns, a vice president of Westport, Conn.-based Saugatuck Technology Inc.