  We update and extend to larger masses our previous analysis of the MSSM with
minimal $SO_{10}$ [MSO$_{10}$SM] soft SUSY breaking boundary conditions. We
find a well--defined, narrow region of parameter space which provides the
observed relic density of dark matter, in a domain selected to fit precision
electroweak data, including top, bottom and tau masses. The model is highly
constrained which allows us to make several predictions. We find the light
Higgs mass $m_h \leq 121 \pm 3$ GeV and also upper bounds on the mass of the
gluino $\mgluino\lsim3.1$ TeV and lightest neutralino $\mchi\lsim450$ GeV. As
the CP odd Higgs mass $m_A$ increases, the region of parameter space consistent
with WMAP data is forced to larger values of $M_{1/2}$ and smaller values of
$m_h$. Hence, we find an upper bound $m_A \lsim 1.3$ TeV. This in turn leads to
lower bounds on ${\rm BR}(B_s\to \mu^+ \mu^-) > 10^{-8}$ (assuming minimal
flavor violation) and on the dark matter spin independent detection cross
section $\sigsip > 10^{-9}$ pb. Finally, we extend our previous analysis to
include WIMP signals in indirect detection and find prospects for WIMP
detection generally much less promising than in direct WIMP searches.
