http://www.roughlydrafted.com/Oct05.5Flaws.html
Here is the gist:
Flaw 1 - Windows' Interactive Services
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| Like all Unix distributions, Mac OS X spawns background system
| processes, called daemons, to handle various tasks.
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Flaw 2 - Windows' opaque and illogical file system presentation
Flaw 3 - 'Least privilege' is impractical and broken
Flaw 4 - No signal of privilege escalation
Flaw 5 - Windows' expensive processes
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| Another problem for Windows is that launching a new process is
| expensive. While Unix was designed to be very efficient at spawning
| new processes, Windows NT was designed to handle parallel processing
| using multiple threads within a single process.
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