100.
We prove that two dual operator algebras are weak
∗ Morita equivalent in the sense of [D.P. Blecher, U. Kashyap,
Morita equivalence of dual operator algebras, J. Pure Appl. Algebra 212 (2008) 2401-2412] if and only if they have equivalent categories of dual operator modules via completely contractive functors which are also weak
∗-continuous on appropriate morphism spaces. Moreover, in a fashion similar to the operator algebra case, we characterize such functors as the module normal Haagerup tensor product with an appropriate weak
∗ Morita equivalence bimodule. We also develop the theory of the
W∗-dilation, which connects the non-selfadjoint dual operator algebra with the
W∗-algebraic framework. In the case of weak
∗ Morita equivalence, this
W∗-dilation is a
W∗-module over a von Neumann algebra generated by the non-selfadjoint dual operator algebra. The theory of the
W∗-dilation is a key part of the proof of our main theorem.
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