JES 4.0 now supports Windows 2000, Linux and HP-UX operating systems, and plans are under way to support Windows 2003 within the next 90 days.
JES 4.0 has also been integrated with Sun's suite of developer tools within the Solaris 10 operating system. More than 3 million registered licenses have been granted for Solaris 10 since it became available last January.
JES is the Santa Clara, Calif., company's infrastructure software platform. It includes Java Availability Suite, Java Identity Management Suite, Java Web Infrastructure Suite, Java Application Platform Suite and the Java Communications Suite.
JES has become a popular sell because Sun has made the licensing cost for JES simple, charging $140 per employee per year to eliminate the confusing nature of software procurement.
By making it possible to run JES 4.0 on disparate operating systems, Sun is hoping customers will take a liking to the software's advanced features and hassle-free licensing proposition, driving usage even higher.