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Computer Glossary - O

OpenType is a scalable format for computer fonts (also sometimes known interchangeably as "typefaces"), initially developed by Microsoft, later joined by Adobe Systems.

Operating Systems
An operating system (OS) is the software that manages the sharing of the resources of a computer. An operating system processes raw system data and user input, and responds by allocating and managing tasks and internal system resources as a service to users and programs of the system.

Outlook Express
Outlook Express was an e-mail/news client that was included in versions of Microsoft Windows from Windows 98 to Windows Vista (it has been renamed Windows Mail in Vista). It was also bundled with Internet Explorer 4.0, and available for Windows 95 and the classic Mac OS. Microsoft Entourage, which is sold as part of Microsoft Office for Macintosh, has replaced the Mac OS X version.