In 1659 van Outhoorn returned to the Indies, employed as Underbuyer (onderkoopman). He was to remain in the East for the rest of his life. Even a journey to nearby Bantam was a journey too far for him. In 1662 he became a member of the Council of Justice (Raad van Justitie) in Batavia. In 1672 he became Receiver-General (ontvanger-generaal), and in 1673 he became Vice-President of the Council of Justice. In 1678 he was charged with a mission to Bantam and he became an extraordinary member of the Dutch Council of the Indies. He was named a full Counsellor, being confirmed in that post in 1681. He became President of the Council of Justice in 1682 and in 1689 President of the College van Heemraden (dealing with estate boundaries, roads, etc.). That same year he was appointed First Counsellor and Director-General of the Dutch East Indies.
He requested that he be allowed to remain on his estate just outside Batavia. Such requests were generally not allowed, for fear that retired governors would interfere with the work of their successors. However, because he was in ill-health and was over 70, he was allowed to stay. He died at age 85 on 27 November 1720 in Batavia.
His term of office was not marked by many important developments or events. At the end of his term, Amangkurat IISultan of Mataram died. As the VOC did not recognise his son as successor, a long war broke out just before Van Outhoorn left office. In 1693 the French overran Pondicherry. During his time, efforts were made to establish coffee growing in Java. The first harvest failed because of flooding, but the next harvest had more success.
Van Outhoorn was not a very strong ruler. Corruption and nepotism, in which he was also involved, became more blatant during his time. His son-in-law Joan van Hoorn, married to his daughter Susanna, succeeded him as Governor-General.