'Just because we're announcing Postgres now doesn't mean we're done,' he said. Sun sees customers looking at a variety of open-source databases, and the company wants to get Solaris ready as a platform for them, he said.

So far, Sun has sold more than 3.3 million licenses for Solaris 10, which runs on Intel x86 and AMD Opteron hardware. The next Solaris 10 software update, due next month, will also include the GRUB boot loader for x86 and x64 hardware, making it easier to run multiple operating systems on a single system.