Mac OS X Server 10.3 10 CAL, Apple has integrated popular open source software technologies and created innovative management tools to make it easy to provide powerful standards-based server solutions. With over 150 new features, including centralized directory and authentication for Mac and Windows clients, Mac OS X Server is a comprehensive platform that is ideal for corporate and educational institutions. This 10-client edition of Apple's award-winning UNIX-based server operating system is the easiest way to deploy powerful Internet, network, and small workgroup services. Mac OS X Server is available in 10-client and Unlimited-client editions to meet the needs of your organization. Client restrictions apply only to simultaneous file sharing services for Mac and PC clients. The Mac OS X Server 10-client edition is designed for small workgroups and Internet hosting services that do not require simultaneous file sharing to more than 10 Mac and PC clients. Part Number M9235Z/A.