I discuss the importance of the O(g4m2t/M 2 W ) corrections to the effective electroweak angle and MW in the indirect determination of the Higgs mass. I emphasize the rôle of a very preciseMW measurement on the MH estimate. ∗ Talk presented at the Zeuthen Workshop on Elementary Particle Theory ”Loops and Legs in Gauge Theories” Rheinsberg, Germany, April 19-24, 1998