"The operating system, once the province of hobbyists
and geeks, is going mainstream. A case is building that
open-source software, freely modifiable and subject to
constant improvement by a global community of coders,
can pay off in savings and efficiency.
Take Amazon.com. Last year, the online retailer switched
to Linux across most of its computer network. Amazon had been using a proprietary version of
Unix, a system often found in large computing environments."