  We address the computation of \Gamma_Z and of the intriguing quantity R_b in
the MSSM including full treatment of the Higgs sector. For a pseudoscalar Higgs
mass m_{A^0}>70\,GeV and CDF limits on m_t, the bounds on R_b at 1\sigma level
leave no room to the MSSM to solve the `R_b crisis' for any combination of the
parameters, not even admitting the possibility of a light chargino and a light
stop of O(50) GeV; however, for m_t not restricted by CDF, a `tangential'
solution exists in the window 2<\tan\beta<10 with a light chargino and stop. In
contrast, for a pseudoscalar mass 40\,GeV<m_{A^0}<60\,GeV and CDF limits on
m_t, the `R_b crisis' can be solved in a comfortable way, for any SUSY spectrum
above the phenomenological bounds, provided \tan\beta>m_t/m_b. Our general
conclusion is that, if there is a `R_b crisis' at all, its solution within the
MSSM has to do more with the peculiar structure of the SUSY Higgs sector rather
than with the spectrum of genuine supersymmetric particles. In view of the
range predicted for m_{A^0}, LEP 200 should be able to definitely settle down
this question.
