I'm mostly libertarian and I support Ron Paul.

One of the areas I'm skeptical is that I think antitrust regulations
provide a valuable check on unfair competition.  The most efficient
marketplace is a monopoly.  The problem is that in many cases once a
supplier attains monopoly status, he has power to create barriers to
entry.  Then prices can rise and innovation is stifled.

That said, you make an excellent point that Microsoft is a poor
example of a free market corporation.  Microsoft's tools and formats
are as entrenched as they are because of use by schools and
governments.  They have fought tooth and nail in every case where
voters or legislatures have sought to require OpenDocument or, more
generally, standardized formats.  This is inappropriate.

Schools should teach theory, not harness students to industry.
Whenever possible, government documents should be available to all
citizens, and interaction with the government should not be limited to
those that have paid their dues to a protected monopoly corporation.

There is no technical reason why governments cannot begin producing
their documents using standardized formats rather than inadequately
documented proprietary ones.