Michigan Compiled Laws, Chapter 556. Powers of Appointment § 556.210

Sec. 110. (1) A power of attorney terminates if any of the following occur:

(2) An agent's authority terminates if any of the following occur:

(3) Unless the power of attorney provides otherwise, an agent's authority is exercisable until the authority terminates under subsection (2), notwithstanding any lapse of time since the execution of the power.

(4) Termination of an agent's authority or of a power of attorney is not effective as to the agent or another person that, without actual knowledge of the termination, acts in good faith under or in reliance upon the power. An act so performed, unless otherwise invalid or unenforceable, binds the principal and the principal's successors in interest.

(5) Incapacity of the principal of a power of attorney that is not durable does not revoke or terminate the power as to an agent or other person that, without actual knowledge of the incapacity, acts in good faith under or in reliance on the power. An act so performed, unless otherwise invalid or unenforceable, binds the principal and the principal's successors in interest.

(6) The execution of a power of attorney does not revoke a power of attorney previously executed by the principal unless the subsequent power provides that the previous power is revoked or that all other powers of attorney are revoked.