Seems Solaris 9 is not only rock solid but blessed, as well. See TechWeb’s Vatican site performed well for funeral for a quick overview of the computing challenges surrounding the funeral of Pope John Paul II:
During the downtime, the Vatican apparently switched its system to Sun Microsystems Solaris 9 operating system running an Apache 1.3.31 web server, Miller said. Before the apparent meltdown, the Site ran on HP’s Tru-64 Unix system with Apache 1.3.27.
Imagine if they had been running Solaris 10?