We discuss the advantages and disadvantages of OpenSource e-commerce software from the perspective of a company wanting to be present on the World Wide Web. The OpenSource movement, its license model and its development model are explained. The functionality of commercial e-commerce solutions and OpenSource e-commerce solutions are compared. Security issues are discussed. An approach to customizing an e-commerce solution taken by consultants is described. After that the total cost of ownership of e-commerce software is analyzed and a conclusion is drawn.