That means nearly 90% of the desktop computers in the world are running on Windows products. It also means that the rival operating systems are not even competitive with Microsoft’s offerings. All of the Apple Mac OS 10 systems had a market share of 6.71% and Linux had a share of 2.98%. This means that Apple is not even big enough to be a niche player in this market. Even Linux, which is theoretically the biggest threat to Windows, is tiny.