  We consider crossed product von Neumann algebras arising from free Bogoljubov
actions of the integers. We describe several presentations of them as
amalgamated free products and cocycle crossed products and give a criterion for
factoriality. A number of isomorphism results for free Bogoljubov crossed
products are proved, focusing on those arising from almost periodic
representations. We complement our isomorphism results by rigidity results
yielding non-isomorphic free Bogoljubov crossed products and by a partial
characterisation of strong solidity of a free Bogoljubov crossed products in
terms of properties of the orthogonal representation from which it is
constructed
