Allowing non-quoted "." and "," in display-name?

I just received an e-mail which had the following headers (excerpted):

     Received: from SELDMSX01.corpusers.net ([10.129.0.161]) by
         seldcon01.corpusers.net with Microsoft SMTPSVC(6.0.3790.1830);
         Tue, 29 Nov 2005 10:14:09 +0100
     X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0
     ...
     From: =?iso-8859-1?Q?H=E4ggstr=F6m=2C_Daniel?=
         <[email protected]>

After MIME decoding, the From: field of this e-mail looks like this:

     From: Häggström, Daniel <[email protected]>

This causes my mail program (Macintosh Eudora) to go wild,
believing that "Höggström" and "Daniel" are two different
people and trying to send my reply to both of them.

The way I understand it from RFC 2822, it is the sending mail program
(Microsoft Exchange V6.5.7226.0) which is faulty, since the
From: field should have been:

     From: "Häggström, Daniel" <[email protected]>

RFC 2822 allows "." without quotes as "obs-phrase" i.e. something
you should receive but not produce. Is "," also going to be
accepted without quotes in the future?
-- 
Professor Jacob Palme <[email protected]> (Stockholm University and KTH)
for more info see URL: http://www.dsv.su.se/jpalme/