Sun Software Service Standard, Premium and Premium Plus plan offerings are available for Sun Directory Server Enterprise Edition and can be purchased either through a Sun sales representative, an authorized Sun reseller, or online at http://www.sun.com/sales/index.jsp. These service plans include telephone and online technical support, on-demand software updates, online system administration resources, support notification services and one-stop interoperability assistance (Premium and Premium Plus plans only). In addition, the Premium Plus plan features a customer advocate and a customer-focused support team.
For complete feature set information, visit: http://www.sun.com/service/serviceplans/software/overview.xml
You may access the service lists describing all Sun service program offerings at: http://www.sun.com/servicelist