  Imaginary part of the microwave conductivity \sigma''(T<T_c) and the
resistivity \rho(T)=1/\sigma(T>T_c) along (\sigma_{ab}'' and \rho_{ab}) and
perpendicular to (\sigma_c'' and \rho_c) cuprate ab-planes of YBa_2Cu_3O_{7-x}
crystal were measured in the temperature range 5\leq T \leq 200 K, having
varied the oxygen doping level x in the crystal from 0.07 to 0.47. The
superconducting state was found to have the dependences
\sigma_{ab}''(T)/\sigma_{ab}''(0) and \sigma_c''(T)/\sigma_c''(0) coincide in
the optimally doped (x=0.07) crystal. With the increase of x the dependences
\sigma_c''(T)/\sigma_c''(0) have smaller slope at T<T_c/3 with
\sigma_{ab}''(T)/\sigma_{ab}''(0) changing slightly. The ab-plane transport in
the normal state of YBa_2Cu_3O_{7-x} crystal always remains metallic. However,
a crossover from Drude conductivity (at x=0.07) along the c-axis to the hopping
one (at x>0.07) takes place. This is proved by both estimating minimum metallic
c-conductivity and maximum tunneling c-conductivity and quantitatively
comparing the measured dependences \rho_c(T) with the ones calculated in the
polaron model of quasiparticles' c-transport.
