Depends on your definition of microkernel. Maybe it wasn't pure, but It was in many ways closer to a microkernel than a monolith; sure the filesystem ran in rin

Depends on your definition of microkernel. Maybe it wasn't pure, but It was in many ways closer to a microkernel than a monolith; sure the filesystem ran in ring 0, but it was scheduled onto its own threads by the scheduler just like any other process.