Mich. Comp. Laws § 570.102
In the case of a subcontractor, he shall within 60 days after furnishing the last material or supplies or performing the last work covered by his subcontract, serve a written notice in duplicate upon the board of officers or agents contracting on behalf of the state, county, city, village, township or school district as aforesaid, that he is a subcontractor for the doing of some part of such work, which he shall specify in his notice and that he relies upon the security of the bond by this act required to be given by the principal contractor, and the said board of officers or agents shall within 10 days thereafter furnish a copy of such notice to the sureties for the principal contractor: Provided, however, That if such notice is not furnished by the said board of officers or agents within the said 10 days such failure shall in no wise release or impair the obligation of said sureties, and whenever this shall have been done, the said subcontractor shall be entitled, subject to the rights of the persons with whom he has contracted for labor, materials or supplies to the benefit of the security given by the principal contractor, and to be subrogated to the liens of the persons who have performed labor or furnished materials or supplies for such building, repairs or ornamentation, whom he shall have actually paid, but the subcontractor and the persons who shall have performed labor or furnished materials or supplies to him shall not in the aggregate be entitled to receive larger sums that may be required from the principal contractor under his contract with the subcontractor, nor shall this act be construed to change in any way the contract which may have been made between the principal contractor and the subcontractor, except when such contract shall attempt to relieve the principal contractor as against the demands of those performing labor or furnishing materials or supplies to the subcontractor. All others, excepting those furnishing labor, relying upon the security given by the principal contractor, shall within 60 days after furnishing the last material or supplies, serve a written notice in duplicate upon the board of officers or agents contracting on behalf of the state, county, city, village, township, or school district as aforesaid, that such contractor or subcontractor is indebted to them in a specified amount or for the furnishing of certain specified materials or supplies on account of such contract, and the said board of officers or agents shall within 10 days thereafter furnish a copy of such notice to the sureties for the principal contractor: Provided, however, That if such notice is not furnished by the said board of officers or agents within the said 10 days such failure shall in no wise release or impair the obligations of said sureties.
MCL 570.102