>> There is no curly quote in ISO-8859-1.  It is not valid ISO-8859-1.  There
>> are Macintosh and Windows extensions to ISO-8859-1 which are not compatible
>> with one another, as I explained.
> 
> Thanks for the clarification - I suspected the fault was on the sender's
> side.

That's where this part comes into play:
   Content-Transfer-Encoding: quoted-printable

This
   Content-Type: text/plain; charset=ISO-8859-1
as Dan said, doesn't have the curly single apostrophe.

Quoted-printable encoding is an "evolved" pseudo-standard.  It used to mean
"encode non-printable characters in a manner whose meaning is mostly evident
to a human reader and which you can decode if you receive it yourself".

A curly single apostrophe is visually identical to a comma...other than its
vertical displacement.  So it was a fairly reasonable mapping...in its day.

I'm not really sure that the definition has been made any more rigorous.

> I do understand that the Mac and Windows systems use their own native
> encoding, but I expect that a mailer would translate to an appropriate
> standard character set correctly (such as ISO-8859-1 or Unicode). Entourage
> seems to do this correctly - thanks to Dan and the rest of the team - but I
> notice that most Windows tools do not handle this correctly.

If and only if the mail client in question actually handles Unicode.
Unicode is relatively new and is a fairly high end feature.  It's hard to do
correctly.

ISO-8859-1 is kind of the lowest common denominator.

> I wonder how many business men (besides the ones I know about) have lost
> contracts with potential customers in Japan and China not realizing that
> their Windows system encoded the combination 's as the character meaning
> foolish or stupid and insulted the persons they were trying to persuade to
> purchase their product....

Now that is an unfortunate translation...  But, in some ways a
self-fulfilling characterization. ;-)


Summary: The encoding isn't technically "wrong" and thus there's not really
any "fault".

mikel


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