On the base of a microscopic model of the superconducting proximity effect the spin polarization of quasiparticle and Coopper pairs density of state (DOS), as well as critical current of SFIFS and SFIS Josephson junctions have been calculated as functions of value of a ferromagnetic exchange field, boundary transparency, and strength of the proximity effect. It is shown that due to a "magnetic proximity effect" the critical current in the SFIFS contacts can reverse its sign and a crossover to "pi"-state of the junctions takes place even at the mesoscopic thickness of the F layer.