First, select a target operating system (OS) release for Sun Ray Server Software 4.0. If the target OS requires no upgrade, then install the Sun Ray server software with data preserved automatically, and you're done. If the target OS does require an upgrade, determine whether the installed SRSS supports the new target OS. If so, update the Solaris operating environment, then install Sun Ray Server Software 4.0 as above. If not, then preserve the existing Sun Ray configuration and data, unconfigure and remove installed Sun Ray server software, then update the Solaris operating environment and, finally, install SRSS 4.0 with preserved data.