> microkernels were an unsolved problem Wrong. The "problem" is designing an operating system that is reliable, fast, fault-tolerant, user-friendly, maintainab

> microkernels were an unsolved problem Wrong. The "problem" is designing an operating system that is reliable, fast, fault-tolerant, user-friendly, maintainable, etc etc. "microkernels" are just one example of a proposed solution to solve this problem - a design that despite the fanatical support of rabid academics like Tenenbaum has been shown to be a poor choice due to the complexity involved in implementation.