Smith Barney, Salomon Brothers, SoundView Financial and Gruntal & Co have all now cut their 1996 estimates for IBM Corp: Lehman Brothers analyst Don Young said he was cutting second quarter estimates by $0.09 a share, but he reckons that while The pressure on bi-polar mainframe pricing was surprising, sales of the older bipolar models will fall rapidly and be immaterial by the fourth quarter of the year.