The market share difference between the Windows install base and Apple Mac OS is huge. A recent study showed Windows with 88% of total market share with Mac OS at 10% for desktop computers. A school of thought assumes the statistics are skewed by a North American sample extrapolated to the world. Global stats have shown Windows as high as 93% and Mac OS at under 5%. Either way, there is a large slant towards Windows desktops. This is the first statistic skewing perception and reliability. If every 5 systems have some sort of issue, the number of issues in the Windows environment will still dominate through a sheer lead in numbers. The second difference is the business model – Microsoft sells the Windows operating system which is installed and integrated with components certified by hunderds of vendors. Windows must inter-operate successfully with an enormous number of variables if all combinations are taken into account. Apple sells a dozen MACs all engineered to operate successfully with the MAC operating system. The only comparison nearing appropriateness would be to compare a family of Dell Windows PCs or HP Windows PCs with Apple PCs to determine realtive reliability and security differences. All other comparisons are really comparing Apples and oranges.