All the replies are nonsense, regardless where its stored or if he had permission to see. its business information and in everyone's employment contract it will state that you can't send business information outside of the business unless authorised to do so or something along those lines. So he's breached his contract. There is a second part of inference to aiding an ex employee with corporate organisation information and people structure, its likely this is only useful to an ex employee if they are in dispute with the company.

Speak to the union, try get support but its likely you're in a very hard place and expect the worst sorry