Wis. Stat. § 865.09: Powers and duties; time of accrual.

(1) A personal representative to whom letters have been issued by the probate registrar and whose letters have not been revoked has all the powers of a personal representative to whom letters have been issued by the court.

(2) The duties and powers of a personal representative appointed under this chapter commence upon the personal representative’s appointment. The personal representative’s powers relate back in time to acts by the personal representative prior to appointment which are beneficial to the estate.