  We establish the null controllability of forward and backward linear
stochastic parabolic equations with linear Robin (or Fourier) boundary
conditions. These equations incorporate zero and first order terms with bounded
coefficients. To prove our null controllability results, a key tool will be the
derivation of two new global Carleman estimates for the weak solutions of the
corresponding adjoint equations in negative Sobolev space. These Carleman
estimates are established using a duality method.
