content: I guess Windows is built on an obsolete concept as well. Are you familiar Minix? I'm just looking into Minix 3.0 right now.  @Frenchgeek How is Linux based on Minix when they were being developed at the same time? And Linux/monolithic kernel and Minix/microkernels ? @Frenchgeek You're right, Linux is an offshoot of Minux.