Mich. Comp. Laws § 28.425h

Sec. 5h. (1) An individual who is licensed to carry a concealed pistol on the effective date of the amendatory act that added this section may carry a concealed pistol under that license until the license expires or the individual's authority to carry a concealed pistol under that license is otherwise terminated, whichever occurs first. (2) An individual who is licensed under this act to carry a concealed pistol on the effective date of the amendatory act that added this section may apply for a renewal license upon the expiration of that license as provided in section 5l.