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Magnetic fields have only recently been included in theoretical simulationsof high-mass star formation. The simulations show that magnetic fields can playa crucial role not only in the formation and dynamics of molecular outflows,but also in the evolution of circumstellar disks. Therefore, new measurementsof magnetic fields at milliarcsecond resolution close to massive young stellarobjects (YSOs) are fundamental for providing new input for numericalsimulations and for understanding the formation process of massive stars. Thepolarized emission of 6.7 GHz CH3OH masers allows us to investigate themagnetic field close to the massive YSO where the outflows and disks areformed. Recently, we have detected with the EVN CH3OH maser polarized emissiontowards 10 massive YSOs. From a first statistical analysis we have foundevidence that magnetic fields are primarily oriented along the molecularoutflows. To improve our statistics we are carrying on a large observationalEVN campaign for a total of 19 sources, the preliminary results of the firstseven sources are presented in this contribution. Furthermore, we also describeour efforts to estimate the Lande' g-factors of the CH3OH maser transition todetermine the magnetic field strength from our Zeeman-splitting measurements.

Magnetic field measurements at milliarcsecond resolution around massive young stellar objects