Whether one agrees or not with the facts and reasoning of the author (a successful hedge-fund manager with a widely followed blog), this blog post is important in and of itself because of what it represents: a tectonic shift in the business community's perception of Microsoft. The business community is now openly doubting the future relevance of the Windows platform!
He has never been particularly bullish on Microsoft. He wrote about his "new" concerns nearly two years ago. [2]
[1] http://brontecapital.blogspot.com/2010/08/microsoft-accounti...
[2] http://brontecapital.blogspot.com/2010/09/microsoft-laid-bar...