Michigan Compiled Laws, Chapter 556. Powers of Appointment § 556.118

Sec. 8. (1) Unless the creating instrument expressly provides that a power cannot be released or expressly restricts the time, manner or scope of release, all powers may be released except as provided in subsection (2).

(2) Unless the creating instrument expressly provides otherwise, a special power may not be released if either the power is not presently exercisable, or the power is exercisable by a trustee or other fiduciary in a fiduciary capacity which requires the exercise of the power.

(3) The release of a power may include all or any part of the property subject to the power; reduce or limit the persons or objects, or classes of persons or objects in whose favor the power is exercisable; or limit in any other respect the extent to or the manner in which the power may be exercised.

(4) A release may be effected, either with or without consideration, by written instrument signed by the donee and delivered.

(5) Delivery of a release may be accomplished in any of the following ways, but this subsection does not preclude a determination that a release has been delivered in some other manner: