In the late 90s I was able to produce spectacular performance with OS/2, DB2, Java and Caucho's Resin (a Java httpd) while serving dynamic web pages. Due to the (server) stability of OS/2 and its multi threaded nature, IBMs commitment to Java, DB2 wih Java integration and early XML/XSL implementations, I was able to produce a bleeding edge content management system. I'm talking approx. 1997 to 2001. When IBM killed off OS/2 I switched to Linux which by then had Java implementations that could match OS/2s, also by IBM. You can guess I have fond memories of OS/2.