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Microlensing observations can be used for determining the shape of the Milky Way's halo. It can be shown that the data are best described with moderately flattened halo, 0.5 < q < 0.6. We discuss, by taking into account this result, the constraints on the baryonic mass-density parameter, Ω_B, and their implications on the value of the Hubble constant H_0, i.e. h. Our conclusion is that current data, in order to satisfy BBNS and Galaxy dynamics constraints, strongly suggest that h should takearXiv:astro-ph/9909240v1 fatcat:easdq67ysbfs3fzyppowx7a4ba