They say if you can't afford mainframe (or AS/400) and you have a big database then it's the best OS and hardware. Many big oracle and db2 database are running on it. But if you have a thousand user, you really need mainframe. It's business, I guess.

Of course OS/400 and DB2 are integrated and that's a big difference.

Good to hear that AIX is booming, the only problem is that in North America, there's too few AIX administrator.