Mich. Comp. Laws § 450.1336

Sec. 336. (1) Unless the articles of incorporation or bylaws provide otherwise, the board may authorize the issuance of some or all of the shares of any or all of its classes or series without certificates. The authorization does not affect shares already represented by certificates until the certificates are surrendered to a corporation. (2) Within a reasonable time after the issuance or transfer of shares without certificates, the corporation shall send the shareholder a written statement of the information required on certificates under section 332 and, if applicable, sections 472 and 488.