Does the state have the right to consider Microsoft to be a monopoly?

This article deals with computer operating systems, their common features w ith classical monopolistic industries containing a natural monopoly element , and the right of the state to regulate monopolies according the philosoph ic principles of utilitarianism and laissez-faire. An analogy between opera ting system and infrastructure of network industry is presented. Fixed cost s of building an infrastructure and the writing of a program are similar; t hey are indivisible and sunk. The marginal costs of maintaining the infrast ructure and program licensing are low. Operating systems bear all identical features that define natural monopolies. The owner of an operating system can practice all kinds of predatory behavior known in oligopolistic industr ies. Therefore, we can consider operating system to be equivalent to monopo listic infrastructure and the society has a right to examine the behavior o f the owner according the definitions of anti monopolistic laws and anticom petitive behavior.