  We study vertex corrections to the leptonic electroweak observables in the
general MSSM at tan(beta) < 35. In particular, we address the question of
whether supersymmetry can be responsible for the observed 2 sigma deviation
from the Standard Model prediction in the invisible width of the Z. We find
that the presence of a light (around 100 GeV) chargino and sleptons hinted by
the muon g-2 measurements makes the agreement with experiment slightly better
and improves the electroweak fit.
