You can access window network shares through Outlook Web Access (OWA).
You need to allow the servers you want users to access first or you will see an error. The error is: “For security reasons, Outlook Web Access is configured to prevent access to this type of document or folder. For more information, contact technical support for your organization.”
How to add server shares in Exchange:
Open Exchange Management Console and expand Server Configuration –> select Client Access Server. Then right click on the OWA directory –> Select Properties.