Open source software such as Apache Web server and the Linux server operating system have become popular systems to run not only on network servers, but also on server appliances (servers dedicated to single tasks such as e-mail and Web site hosting).

CNN: Red Hat to support "all things open source"

These cloud and web hosting customers appreciate the cost savings associated with a lower cost infrastructure, yet still want to deploy a server-class product with reliability and security features and server OS certification.

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