strangest systems I've sent email from

[Chris Hanson]

On May 17, 2016, at 11:21 AM, Sean Conner <spc at conman.org> wrote:
> 
>  While the Amiga may have "cheated" by passing a reference to the message
> instead of copying it, conceptually, it was passing a message (for all the
> user knows, the message *could* be copied before being sent).  I still
> consider AmigaOS as a message based operating system.  

This is mostly what real microkernels do as well: Mach got very well-documented speedups from zero-copy sends that were specifically enabled by clever use of memory management hardware, and these kinds of techniques are still used in xnu on OS X today.

  -- Chris