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We present a solution to the $\mu$ problem in an SO(10) supersymmetric grandunified (SUSY GUT) model with gauge mediated (GMSB) and D-term supersymmetrybreaking. A Peccei-Quinn ({\bf PQ}) symmetry is broken at the messenger scaleand enables the generation of the $\mu$ term. The invisible axion (Goldstoneboson of {\bf PQ} symmetry breaking) is a cold dark matter candidate. At lowenergy, our model leads to a phenomenologically acceptable version of theminimal supersymmetric standard model (MSSM) with novel particle phenomenology.Either the gluino or the gravitino is the lightest supersymmetric particle(LSP). The phenomenological constraints on the model result in a Higgs withmass $\sim 86 - 91$ GeV and $\tan\beta \sim 9 - 14$.Comment: Talk given at The Meeting of The Division of Particles and Fields of  The American Physical Society (DPF 2000), Columbus, Ohio, August 9-12, 2000,  3 p

μ PROBLEM, SO(10) SUSY GUT AND HEAVY GLUINO LSP