A system software component that is external to the operating system kernel. If the phrase is used to refer to the operating system itself, it is redundant because an operating system "is" software.

An operating system that is designed for a server. Normally, it is a complete operating system with file, task and job management; however, with some earlier products, it was a separate component that ...

NEEDHAM, Mass.--(BUSINESS WIRE)--International Data Corporation (IDC) today published its annual server operating system environment (OSE) market share and forecast reports as well as in-depth survey ...