Besides, Linux is a dreadful multi-vendor solution that will not work well for the enterprise as whole. In contrast, Microsoft continues to offer an unprecedented number of services as part of the overall operating system environment making the Windows platform a tremendous value proposition. If another operating system were to arise to compete with Windows, it would need to match Window's level of services and accessibility, but with enhanced scalability and reliability. This isn't about Linux, but it's interesting nonetheless. Performance, reliability, TCO, security, desktop suitability.
Facts are so much more reliable than myths.
This seems to indicate they consider Linux their most important competitor at the moment. You can read about the results in my page on corporate ethics .