[nickpsecurity]

Had less attack surface (microkernel), isolated failures, easier to upgrade, and could be self-healing within one node. Important to some people. They kept paying for it until numbers justified RIM buying it for its potential. ;)

[qwertyuiop924]

Indeed. It's one of the Microkernel architecture's (semi-rare) success stories. It goes to show that yes, Microkernels are complicated, and hard, but if you pull it off there are real benefits.