Sun Microsystems’ operating margin guidance of +4% for 4Q07 and +10% for the long term is likely to prove conservative in view of the higher-than-expected margins and revenues so far and additional opex leverage in 2H07 and beyond, the analyst says. The EPS estimates for 2007, 2008 and 2009 have been raised from $0.05 to $0.10, from $0.25 to $0.28 and from $0.35 to $0.38, respectively.