Microsoft was locked in as the leader because they are cheaper than mac, known to exist (unlike linux to the masses) and because they were at the top when everyone bought their first computer to look at internet porn about 5-10 years ago.
They will continue to be at the top, until the average computer user knows the difference. Which they don't.
They will continue to be at the top, until the average computer user knows the difference. Which they don't.