  Magnetoresistance (MR) of Bi-2212 single crystals with T$_{c}$ $\approx 87-92
K$ is studied in pulsed magnetic fields up to 50T along the c-axis in a wide
temperature range. The negative out-of-plane and the positive in-plane MRs are
measured in the normal state. Both MRs have similar magnitudes, exceeding any
orbital contribution by two orders in magnitude. These are explained as a
result of the magnetic pair-breaking of preformed pairs. Resistive upper
critical fields H$_{c2}$(T) determined from the in-- and out-of-plane MRs are
about the same. They show non-BCS temperature dependences compatible with the
Bose-Einstein condensation field of preformed charged bosons.
