Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.3503

Sec. 3503. (1) The pendency of a proceeding for supervised administration of a decedent's estate stays action on a pending informal application or an informal application filed after commencement of the proceeding for supervised administration.

(2) If a will has been previously probated in informal proceedings, the filing of a petition for supervised administration has the same effect as a formal testacy proceeding under section 3401.  1

(3) After receipt of notice of the filing of a supervised administration petition, a personal representative who has been previously appointed shall not exercise the power to distribute the estate. The filing of such a petition does not affect the personal representative's other powers and duties unless the court restricts the exercise of any of those powers and duties pending full hearing on the petition.