There isn't any reason why Linux can't be implemented as an enterprise computing solution. In our performance tests, Linux soundly licked all its opponents, including BSD and NT, which cost hundreds of dollars more. What's more, the system scales beautifully, from 153 connections and 646 kilobytes of throughput with 100 users connected, to 230 connections per second and 996 kilobytes of throughput with 300 virtual users connected. It's powerful, it's open, it's free.
Reliability is one of the first.