Linux
Our most popular server operating system, a freeware product, Linux is a hard value to beat. Linux use has grown as fast as the Internet. No surprise Linux is well suited to Internet servers. Linux has also become well-established for database and application servers.
Server
Windows is found on many types of servers, Internet, file and print, database and application servers.

The IBM i operating environment integrates a trusted combination of relational database, security, Web services, networking and storage management capabilities.