Many "big" companies are using Solaris (and other UNIXes) because they have been for a long time, and there is a cost to switching. Upgrades to the kind of sys

Many "big" companies are using Solaris (and other UNIXes) because they have been for a long time, and there is a cost to switching. Upgrades to the kind of systems Solaris is being used (core systems and databases) tend to stay in the same course, not only because there is a lower risk in staying on the same OS/architecture combo, but also because most of those systems are old and tied to Solaris/SPARC. Unless there is a sufficiently strong reason to switch, most "big" companies prefer to pay the premium (in SW and HW) than assume the risk. Solaris on commodity funcions is dying rapidly, if one can't already consider it dead. The notion that Linux is less advanced is bogus. In some aspects Solaris is more advanced, in others Linux has the lead. What matters is what's the best choice for a each task given constraints of cost, reliability and availability of skilled technicians.