In 2001, due to a loss of sponsorship as a result of Canadian law, its status was stripped, and was replaced by the Women's British Open, an existing event which was already a major on the Ladies European Tour.

From 2007 to 2009, the CWO was the third richest event on the LPGA Tour, behind only the U.S. Women's Open and the Evian Masters in France.

In 2018 Brooke Henderson became the first Canadian in 45 years, and only the second ever after Jocelyne Bourassa won the inaugural event in 1973, to win Canada's national open.

In 2000, the tournament was threatened by new regulations prohibiting any tobacco advertising at sports and cultural events, requiring du Maurier to end its sponsorship.

Due to this uncertainty, the LPGA Tour stripped the du Maurier of its major status in favour of the Women's British Open.

1 - 1995 du Maurier winner Jenny Lidback had dual citizenship (Peru and Sweden) at the time of her win.