&gt; The Mac OS is pretty, well-designed components for GUI&#x2F;desktop on top of a hybrid between a microkernel and UNIX (BSD). Let&#x27;s ignore their bad choice of microkernel.<p>Is it necessary to ignore the microkernel choice? Isn&#x27;t MacOS X -not- microkernel, even though (or &quot;because&quot;) it uses an old version of Mach? [0][1][2]<p>[0] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Mach_%28kernel%29" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Mach_%28kernel%29</a><p>[1] <a href="http:&#x2F;&#x2F;www.roughlydrafted.com&#x2F;0506.mk1.html" rel="nofollow">http:&#x2F;&#x2F;www.roughlydrafted.com&#x2F;0506.mk1.html</a><p>[2] <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=8RwlEZ88rKM&amp;t=445" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=8RwlEZ88rKM&amp;t=445</a>