Mich. Comp. Laws § 500.2107

Sec. 2107. (1) On or before September 1, 1980, each insurer subject to this chapter shall make filings in accordance with this chapter for automobile insurance, home insurance, or both, to be effective not later than January 1, 1981 nor earlier than November 1, 1980. (2) With regard to a filing submitted under subsection (1), the commissioner shall conduct a review of the filing on an informal basis, and a dispute with regard to that filing shall not be considered a contested case under Act No. 306 of the Public Acts of 1969, as amended. A filing not disapproved within 60 days after its submission shall be considered approved. (3) A filing approved or considered approved under subsection (2) shall be exempt from any further proceedings whatsoever under this chapter until July 1, 1981. (4) If a filing is disapproved under subsection (2), the insurer, within 30 days of the order of disapproval, shall make a revised filing with the commissioner. The revised filing shall take effect on January 1, 1981 and shall be subject to review under this chapter on or after January 1, 1981 in the same manner as subsequent filings made under this chapter.