Equivariant formality of moment-angle complexes

We compute the equivariant cohomology $H^*_{T_I}(\mathcal Z_{\mathcal K})$ of moment-angle complexes with respect to the action of coordinate subtori $T_I \subset T^m$. We give a criterion for the equivariant formality of $\mathcal Z_{\mathcal K}$.