(2) Each separately represented party may serve no more than twenty interrogatories upon each party. A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts.Each separately represented party may serve no more than twenty interrogatories upon each party. (g). Does this Defendant have an agent for service in the State of Michigan? If so, state the name and address of the registered agent. In Michigan, parties are allowed to serve written questions on the opposing parties called Interrogatories. The demand must include all of the following: (a) Be served on the person in the manner required for service of process in this state. Interrogatories occur during the discovery process of a lawsuit. MCR. 2.309(A)(2). Availability;. Procedure for. This template is a response to interrogatories for use in a civil action in Michigan circuit court.