Mich. Comp. Laws § 774.3
The dockets, files, and indexes shall be public records and shall be subject to inspection and examination during court hours. If a municipal court does not maintain regular hours, or if the court hours are less than 4 hours during the day, the dockets, files, and indexes shall be available for inspection and examination for at least 4 hours each day, Monday through Friday, except legal holidays. Completed dockets shall be delivered to the county clerk along with the indexes when the municipal judge considers it advisable, but not before 1 year and not later than 4 years after the date of the last case in the docket. Files may be destroyed by the municipal judge, when the judge considers it advisable, at any time after 6 years from the date the case was completed.
MCL 774.3