Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.1947

(1) publishing a copy of the order in a newspaper at least once each week for 4 consecutive weeks or for such further time as the court may require, and

(2) mailing on or before the date of the second publication a copy of the order to the defendant at his address which the plaintiff knows or should by diligent inquiry be expected to know. When the address of any defendant is not known and cannot be ascertained upon diligent inquiry, a copy of the order shall be mailed to the defendant at his last known address. If the plaintiff does not know, and cannot ascertain, upon diligent inquiry, the present or last known address of the defendant, mailing a copy of the order is not required.